{"title":"Optical Tubes Only (OTA)","description":"\u003cdiv\u003e\n  \u003cp\u003eAn optical tube assembly, or OTA, is the telescope without a mount or tripod. It is how most experienced observers and imagers buy, because they already own a mount or want to choose it separately. This collection brings together every tube we sell on its own: refractors from Askar, William Optics, Sky-Watcher, Explore Scientific, Tele Vue, SVBONY, SharpStar and ZWO, Celestron SCT, EdgeHD and RASA tubes, Newtonians and Cassegrains from Orion Optics UK and iOptron, and Maksutovs from several makers.\u003c\/p\u003e\n  \u003cp\u003eBuying a tube alone means you need to think about how it attaches to the mount and what it needs at the back end. That is where we can save you a second order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eBefore You Order an OTA\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDovetail standard:\u003c\/strong\u003e Vixen-style (about 44 mm) bars suit small and medium mounts. Losmandy-style (about 75 mm) bars are used on heavier tubes and mounts. Check what your saddle accepts, or add a dual saddle. See \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail plates\u003c\/a\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRings or no rings:\u003c\/strong\u003e Many refractors come with rings and a short bar. Newtonians and large tubes may need \u003ca href=\"\/collections\/rings\"\u003etube rings\u003c\/a\u003e sized to the exact outside diameter.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReal payload:\u003c\/strong\u003e Tube weight is only the start. Add rings, bar, finder, diagonal or camera, guide scope and dew control.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack end:\u003c\/strong\u003e Visual use needs a diagonal and eyepieces. Imaging needs the correct corrector and adapters for your camera.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCollimation needs:\u003c\/strong\u003e Refractors and Maks rarely need it. Newtonians, RCs and SCTs need occasional adjustment.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhat We Work Out With You\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMount compatibility:\u003c\/strong\u003e We check the dovetail standard, saddle and total payload against your mount.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCounterweight and balance:\u003c\/strong\u003e Long or heavy tubes can need extra counterweight or a longer bar. We check this before shipping.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete back end:\u003c\/strong\u003e We list the diagonal, corrector, spacers and adapters so the tube works the day it arrives.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eOptical Tubes: Frequently Asked Questions\u003c\/h2\u003e\n  \u003ch3\u003eWill this tube fit my mount?\u003c\/h3\u003e\n  \u003cp\u003eIf the mount's saddle accepts the dovetail and the total payload is within its imaging or visual capacity, yes. Send us the mount model and we will confirm.\u003c\/p\u003e\n  \u003ch3\u003eDoes the OTA include a finder or diagonal?\u003c\/h3\u003e\n  \u003cp\u003eIt varies by model. Each product page lists what is included. Ask us if anything is unclear.\u003c\/p\u003e\n  \u003ch3\u003eShould I buy a kit or an OTA?\u003c\/h3\u003e\n  \u003cp\u003eIf you do not own a suitable mount, a kit is usually better value. If you plan to upgrade the mount later, buy the OTA and the mount you really want.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eAdding a tube to your setup?\u003c\/h2\u003e\n  \u003cp\u003eSend us your mount model and planned camera or eyepieces. We will confirm fit and list everything you need.\u003c\/p\u003e\n\u003c\/div\u003e\n","products":[{"product_id":"celestron-36-cm-rasa-ota-cge-dovetail","title":"Celestron 36 cm RASA V2 OTA - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e355.6mm (14\") Rowe-Ackermann Schmidt Astrograph Optical Design\u003c\/li\u003e\n\u003cli\u003eUltra-fast 790mm focal length at an f\/2.2 focal ratio\u003c\/li\u003e\n\u003cli\u003eCovers a 60.1mm image circle, with a usable field up to 70mm\u003c\/li\u003e\n\u003cli\u003eNew Ultra-Stable Focus System (USFS) minimizes focus shift and mirror flop\u003c\/li\u003e\n\u003cli\u003eExtended wavelength range from 400 nm to 900 nm for increased signal\u003c\/li\u003e\n\u003cli\u003eWeighs 75 lbs (34.02 kg) and includes dual CGE\/Losmandy-D style dovetails\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron 36 cm RASA V2 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron 36 cm RASA V2 combines a 355.6mm (14\") aperture with an f\/2.2 optical system for space surveillance, Space Situational Awareness (SSA), other scientific applications and advanced wide-field astroimaging. Its 790mm focal length gives a 60.1mm image circle with spot sizes under 6.3 μm RMS across the field. Unlike most telescopes, which focus only visible light (400 to 700 nm), it focuses an extended range of 400 to 900 nm, which lets a camera sensor detect a brighter signal. Light gathering power is 2581x that of the human eye. The \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e can only be used with a camera, and its images are free of field curvature, off-axis coma and astigmatism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Celestron RASA 36 V2: A 355.6mm Astrograph for SSA and Research\u003c\/h3\u003e\n\u003cp\u003eCelestron built the 36 cm RASA for applications that need large aperture, high speed and a wide, flat field together. Its white paper explains that the 14-inch version was intended primarily for Space Situational Awareness and other space surveillance work, where a large area of sky has to be scanned in a short time to detect very small and faint objects, and that it was meant to be housed in an observatory rather than carried.\u003c\/p\u003e\n\u003cp\u003eFor advanced wide-field astroimaging it is the largest RASA Celestron manufactures, and it is the biggest and fastest (f\/2.2) optical instrument of its kind available off-the-shelf.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Rowe-Ackermann Schmidt Design: A 4-Element Prime-Focus System\u003c\/h3\u003e\n\u003cp\u003eThe RASA optical system is a modern evolution of the classic Schmidt camera. Light first passes through a 355.6mm Schmidt corrector plate, which pre-corrects for spherical aberration. It then reflects off a large, spherical primary mirror and converges toward the front of the tube. Before reaching focus, the light passes through a four-element corrector lens group, and the star images form on a flat plane ahead of it, where the camera sensor sits.\u003c\/p\u003e\n\u003cp\u003eThis is a convenient external prime-focus image capture location with a flat focal plane, providing small spot sizes to the edge of a wide field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ef\/2.2 Speed Across a 70mm Usable Field\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of the RASA 36 is its f\/2.2 focal ratio combined with a 355.6mm aperture and a 790mm focal length.\u003c\/p\u003e\n\u003cp\u003eThis speed is delivered across a massive field of view. The optical system produces an optimized image circle of 60.1mm and a usable field of 70mm, with only minimal performance loss at the edge of the usable field. Off-axis illumination is 83% at 30mm off-axis, and spot sizes stay under 6.3 μm RMS across the field. With a custom camera adapter, the field of view reaches up to 4.4 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e77.5mm Back Focus for Large-Format Sensors\u003c\/h3\u003e\n\u003cp\u003eThe RASA 36 is designed for seamless integration with a wide variety of imaging systems. It provides a generous 77.5mm of back focus, measured from the top of the lens group's threaded collar. This ample back focus accommodates a wide variety of imaging sensors.\u003c\/p\u003e\n\u003cp\u003eThe included M48 camera adapter gives 55mm of back focus. It attaches a DSLR with a 48mm \"wide \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e\" for your camera make, and astronomical cameras with sensors smaller than full frame (43mm diagonal) may also use it with optional adapters such as an M48-to-M42 adapter and M48 extension rings. Cameras with larger sensors need a custom camera adapter; Celestron's \"Camera Adapter Requirements\" drawing gives the design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUsing Filters with the RASA 36 and its Removable Optical Window\u003c\/h3\u003e\n\u003cp\u003eThe RASA 36's front lens cell includes a 104mm optical window. If you plan to use any other glass in the light path, such as a filter or a camera's own optical window, remove the RASA's built-in optical window to maintain the highest level of optical performance.\u003c\/p\u003e\n\u003cp\u003eRemoving the window is a straightforward process. With the camera and camera adapter removed, grasp the knurled cell of the optical window and unthread it. The window housing uses M110 x 0.75 threads on its exterior.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Ultra-Stable Focus System (USFS) at f\/2.2\u003c\/h3\u003e\n\u003cp\u003eThe RASA 36 V2 features Celestron's Ultra-Stable Focus System (USFS). At its heart is a precision linear ball bearing, which minimizes two critical issues: focus shift (lateral image movement during focusing) and mirror flop (mirror movement when slewing across the sky).\u003c\/p\u003e\n\u003cp\u003eThe manual adds that the USFS minimizes unwanted shifting of the primary mirror when focusing and during long exposures. A single focus knob moves the primary mirror within the rear cell, and the USFS is compatible with the optional Celestron Focus Motor (#94155-A).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eActive Cooling: The 12V DC MagLev Fan for Thermal Stability\u003c\/h3\u003e\n\u003cp\u003eAchieving peak optical performance requires the telescope to be in thermal equilibrium with the ambient air. The RASA 36 is equipped with an integrated 12V DC MagLev fan to accelerate this cooldown process. The fan in the rear cell pulls air through vents with micromesh, which keeps dust out of the tube.\u003c\/p\u003e\n\u003cp\u003eThe included battery pack holds eight AA batteries (not included) and powers the fan. Store the astrograph in a cool area and keep it outside for an hour or so before imaging; when the optics have cooled down and you are ready to image, unplug the battery pack to turn the fan off.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLens Group Collimation and Camera Rotation for a Perfect Field\u003c\/h3\u003e\n\u003cp\u003eWhile the RASA 36 is factory-aligned and should not require frequent adjustment, provisions are made for precise collimation. The tilt of the 4-element lens group can be adjusted using three pairs of push-pull screws, to collimate the entire optical system. It must be done with a camera installed: defocus a bright star (Polaris if possible) by about one turn of the focus knob and adjust one pair of screws at a time until the defocused star pattern is concentric.\u003c\/p\u003e\n\u003cp\u003eFraming your target is also straightforward. The camera is secured by a knurled retaining ring. By slightly loosening this ring (no more than 1\/8th of a turn), you can rotate the camera to the desired orientation, then retighten the ring without overtightening it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the 75 lb OTA with Dual CGE\/Losmandy-D Dovetails\u003c\/h3\u003e\n\u003cp\u003eThe RASA 36 is a substantial instrument, with an optical tube weight of 75 lbs (34.02 kg) and a length of 1079.5mm (42.5\"). Choose a mount with a load capacity of more than 75 lb, so the mount performs well when a camera and accessories are added. Moving and mounting the OTA is a two-person job, facilitated by integrated handles on the rear cell.\u003c\/p\u003e\n\u003cp\u003eTo provide flexible and secure mounting, the OTA is equipped with two CGE\/Losmandy D-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bars\u003c\/a\u003e. The main rail attaches the telescope to the mount, and the accessory rail can carry an optional \u003ca href=\"\/collections\/autoguiding\"\u003eguidescope\u003c\/a\u003e. The rear cell has pairs of threaded holes for a Celestron \u003ca href=\"\/collections\/finder-scopes\"\u003efinderscope\u003c\/a\u003e and two sets of two M8x1.25 threaded inserts for custom mounting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIncluded Components and Optional Accessories for the RASA 36\u003c\/h3\u003e\n\u003cp\u003eThe RASA 36 V2 system arrives ready for camera integration. The primary included components are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRASA 36 V2 Optical Tube Assembly:\u003c\/strong\u003e The complete 355.6mm f\/2.2 astrograph.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 Camera Adapter:\u003c\/strong\u003e Provides a standard connection with 55mm of back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFan Battery Pack:\u003c\/strong\u003e Powers the internal cooling fan (requires 8x AA batteries, not included).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSeveral optional accessories complete your imaging setup. A focus motor is an essential accessory you will likely want to add, and the Celestron Focus Motor is fully compatible. For dew, the easiest step is an optional 14\" \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew shield\u003c\/a\u003e; in more severe conditions a dew heater can keep the corrector dry, and Celestron's dew prevention products are compatible with the RASA 36 cm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Step-by-Step Guide to Your First Night with the RASA 36\u003c\/h3\u003e\n\u003cp\u003eGetting started with the RASA 36 involves a few key steps. First, securely mount the 75 lb OTA onto a suitable high-capacity \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mount\u003c\/a\u003e; this should always be done with two people. Next, attach your camera using either the included M48 adapter or a custom adapter to achieve the correct back focus. Once the camera is installed, you can adjust its rotational orientation for framing.\u003c\/p\u003e\n\u003cp\u003eBefore imaging, allow the telescope to cool to ambient temperature. Run the fan from the included battery pack and keep the telescope outside for an hour or so. Once cooled, point the telescope to a bright star to perform your initial focus. With focus achieved, you are ready to slew to your target and begin capturing the deep, wide-field images the RASA 36 is designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch4 class=\"DAV-warning-title\"\u003eSolar Warning\u003c\/h4\u003e\n\u003cp\u003eNever look directly at the Sun with the naked eye or with an optic (unless you have the proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Celestron RASA 36 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optical tube weighs 75 lb (34.02 kg). Choose a mount with a load capacity of more than that, so the mount performs well once a camera and accessories are added. The dovetail rail is compatible with mounts that accept a CGE or Losmandy-D style dovetail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Ultra-Stable Focus System (USFS) on the RASA 36?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe USFS is built around a precision linear ball bearing. It minimizes \u003cstrong\u003efocus shift\u003c\/strong\u003e (unwanted lateral movement of the primary mirror during focusing, which shifts the image) and \u003cstrong\u003emirror flop\u003c\/strong\u003e (movement of the primary mirror when the telescope points to different parts of the sky).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a DSLR camera with the RASA 36 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The supplied M48 camera adapter attaches a DSLR with a 48mm \"wide T-ring\" for your camera make. Because of the steep f\/2.2 light cone, a sensor recessed deep in the camera body can cause vignetting, which is common with full-frame DSLR sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the extended 400 to 900 nm wavelength range for the RASA 36?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost telescopes focus only visible light (400 to 700 nm). The RASA 36 cm focuses an extended range up to 900 nm, and since many cameras respond in the near-infrared, more of the object's light is sharply focused, which yields a brighter signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a large format camera to the RASA 36 V2 to use the full 70mm field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo utilize the full 70mm usable field with a large format camera, you will likely need a custom camera adapter. The RASA 36 has a native back focus of 77.5mm from the threaded collar of the lens group. You will need to calculate the total back focus required by your specific camera, \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e, and any other accessories, then have an adapter machined to place your sensor precisely at the focal plane.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the RASA 36 for visual observing with an eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Rowe-Ackermann Schmidt Astrograph is designed exclusively for prime-focus imaging. There is no provision for attaching a diagonal or eyepiece, as the focal plane is located at the front of the telescope where the camera is mounted.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install filters with the RASA 36?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFilters are installed in the light path between the telescope and the camera sensor, typically within a filter wheel or \u003ca href=\"\/collections\/filter-wheels-and-drawers\"\u003efilter drawer\u003c\/a\u003e. To maintain the best optical performance, remove the RASA's built-in 104mm optical window if you are using any other glass (like a filter) in the imaging train. This prevents the extra glass from altering the optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the RASA 36 V2 suitable for a mobile, dark-sky-site setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a large instrument for a fixed setup. The optical tube alone weighs 75 lb and is 42.5 inches long, and moving and lifting it onto a mount takes two people, using the handles on the rear cell. The 36 cm RASA is intended to be housed in an observatory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow critical is active cooling for the RASA 36?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe astrograph performs best when it has reached thermal equilibrium with the outside air, and the greater the temperature difference, the longer it takes. The built-in 12V DC MagLev fan helps the optics cool to ambient temperature; run it from the battery pack while the telescope sits outside for an hour or so, then unplug it when you are ready to image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e355.6mm (14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e790mm (31.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e60.1mm (2.36\") Ø, 4.4°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable Field\u003c\/td\u003e\n\u003ctd\u003e70mm (2.75\") Ø, 5.1°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Obstruction Diameter\u003c\/td\u003e\n\u003ctd\u003e158mm (6.22\") (44% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e2581x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.39 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.36 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot Size\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 6.3 μm RMS across FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e400 – 900 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced aluminum, XLT Multi-Coated throughout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination\u003c\/td\u003e\n\u003ctd\u003e83% at 30mm (1.18\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Window\u003c\/td\u003e\n\u003ctd\u003e104mm (4.09\") Ø\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (from collar)\u003c\/td\u003e\n\u003ctd\u003e77.5mm (3.05\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (with adapter)\u003c\/td\u003e\n\u003ctd\u003e55mm (2.16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eUltra-Stable Focus System (USFS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e1079.5mm (42.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e406.4mm (16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e75 lbs (34.02 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Features\u003c\/td\u003e\n\u003ctd\u003eVentilation fan, dual dovetail mounting bars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Male (included camera adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eCGE \/ Losmandy D-style, dual rails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRASA 36 V2 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFan Battery Pack\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/s3.amazonaws.com\/celestron-site-support-files\/support_files\/RASA_36_Manual_52366_WEB_rev1.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-\n16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload RASA 36 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-RASA-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload RASA Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967155532061,"sku":"CEL-91078","price":20849.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-36-cm-Rowe-Ackermann-Schmidt-Astrograph-RASA-36-Optical-Tube-Assembly-CGE-Dovetail-91077-1__49856.1594230331.1280.1280.jpg?v=1684337447"},{"product_id":"celestron-8-rasa-ota","title":"Celestron 8” RASA OTA","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e203mm (8\") Rowe-Ackermann Schmidt Astrograph\u003c\/li\u003e\n\u003cli\u003eIncredibly Fast f\/2.0 Optical System\u003c\/li\u003e\n\u003cli\u003e400mm Focal Length for Wide-Field Views\u003c\/li\u003e\n\u003cli\u003e22mm Optimized Image Circle with \u0026lt; 2.3 µm RMS Spot Sizes\u003c\/li\u003e\n\u003cli\u003eLightweight 17 lb (7.7 kg) Optical Tube\u003c\/li\u003e\n\u003cli\u003eUltra-Stable Focus System Mitigates Mirror Shift\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron 8” RASA OTA\u003c\/h2\u003e\n\u003cp\u003eThe Celestron 8” RASA OTA is a portable, wide-field imaging instrument that pairs a 203mm (8\") aperture with an exceptionally fast f\/2.0 optical system. Its 400mm focal length captures vast fields of view, and its light gathering power is 843x that of the human eye, so imagers can use shorter exposure times to capture detail in faint objects. This \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e delivers spot sizes under 2.3 μm RMS across its optimized 22mm image circle, all within an optical tube that weighs just 17 lbs (7.7 kg).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 8\" RASA: An f\/2.0 Astrograph for Portable Wide-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 is a dedicated imaging telescope built for capturing stunning deep-sky objects without the challenges of longer focal length instruments. Its f\/2.0 focal ratio lets imagers use shorter exposure times to capture detail in faint objects. When combined with a sensitive CMOS camera and live-stacking software, the RASA 8 can provide an almost real-time observing experience, showing images on a computer that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye.\u003c\/p\u003e\n\u003cp\u003eThis speed also reduces the demands on your \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mount\u003c\/a\u003e. Because shorter exposures are possible and the 400mm focal length lessens tracking demands, autoguiding will not be required in many cases. Weighing 17 lb, the optical tube is easy to transport to remote dark sky locations and pairs with a wide variety of mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 4-Element Rowe-Ackermann Schmidt Optical System\u003c\/h3\u003e\n\u003cp\u003eThe Rowe-Ackermann Schmidt Astrograph (RASA) design is an evolution of the classic Schmidt camera, engineered for modern digital sensors. Light enters through a Schmidt corrector, reflects off a spherical primary mirror, and then passes through a four-element corrector lens group, which forms a flat field without optical aberrations.\u003c\/p\u003e\n\u003cp\u003eUnlike a traditional telescope where the camera attaches at the rear, the RASA's focal plane is located at the front of the instrument. Your camera is mounted in front of the lens group at the prime focus, which is why the RASA cannot accommodate a traditional \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 400mm Focal Length and 22mm Image Circle at f\/2.0\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8's optical specifications are tailored for wide-field astrophotography. The 400mm focal length captures a vast 3.15° field of view across its optimized image circle. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Image Circle (22mm):\u003c\/strong\u003e Delivers the highest optical performance with spot sizes less than 2.3 μm RMS, ensuring sharp stars from edge to edge on sensors with up to a 22mm diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUseable Field (32mm):\u003c\/strong\u003e The field remains well-corrected out to a 32mm diagonal, with only minimal performance loss at the edge; the APS-C sensors used in many mirrorless cameras are a good choice, while field illumination in the corners is reduced.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWavelength Range (400-800 nm):\u003c\/strong\u003e The optics are specified from 400 to 800 nm, with StarBright XLT coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCamera Integration: Sensor Sizing, 29mm Back Focus, and Adapters\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 is designed for modern astronomical CMOS cameras, smaller CCDs, and mirrorless cameras. Due to its front-mounted design and specific back focus requirements, it is not compatible with standard DSLR cameras. Since the camera mounts in front of the optics, choose cameras that block as little of the aperture as possible: cylindrical bodies under 100mm in outer diameter work best, and avoid any camera body more than 4 inches in diameter. Full-frame (42mm) sensors work, but performance is poor at the edges and field illumination is reduced.\u003c\/p\u003e\n\u003cp\u003eAchieving the correct sensor distance is critical for edge-of-field performance. The RASA 8 requires the camera sensor to be placed precisely at one of two distances, depending on the adapter used.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack Focus from Collar (29mm):\u003c\/strong\u003e This is the native back focus distance measured from the top surface of the main threaded collar on the lens group cell. Custom adapters should be designed to meet this spacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack Focus with M42 Adapter (25mm):\u003c\/strong\u003e When using the included M42 T-thread adapter, the required back focus is 25mm. You will need to add the correct M42 extension rings (not included) to make up the difference between this requirement and your camera's native back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Adapters:\u003c\/strong\u003e The RASA 8 ships with an M42x0.75 T-thread adapter and a C-thread adapter, accommodating a wide range of popular astronomical cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFilter Integration: Using the Integrated Filter Mount\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 has an internal filter mount: the removable 46mm optical window at the front of the lens group can be replaced by Celestron's Light Pollution Imaging Filter for the RASA 8 (sold separately). If you use a filter anywhere in the light path, or if your camera has its own optical window, remove the RASA's window to keep the best optical performance.\u003c\/p\u003e\n\u003cp\u003eTo install a filter, you first remove your camera and the camera adapter. Then, you can carefully unthread the cell holding the 46mm optical window and replace it with a compatible filter, such as Celestron's Light Pollution Imaging Filter designed for the RASA 8 (sold separately). \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Ultra-Stable Focus System\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 is equipped with Celestron's Ultra-Stable Focus System (USFS), a design that mitigates the lateral \"mirror shift\" that can occur when focusing or slewing. The key to this system is a precision linear ball bearing, which Celestron tests during assembly.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e moves the primary mirror forward and back within the optical tube. While a single turn of the knob produces very fine movement, it takes approximately 30 full turns to move through the entire focus range. For automated and remote focusing, the RASA 8 is fully compatible with the Celestron Focus Motor (sold separately), allowing you to achieve critical focus from the same computer controlling your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 12V DC Active Cooling System\u003c\/h3\u003e\n\u003cp\u003eFor an optical system to deliver its best performance, it must be in thermal equilibrium with the ambient air. The RASA 8 features an integrated air-cooling system to speed up this process. A 12V DC MagLev fan in the rear cell pulls air through the mesh vents on the perimeter of the rear cell; the mesh keeps dust out.\u003c\/p\u003e\n\u003cp\u003eThe fan is powered by the included battery pack, which requires eight AA batteries (not included). Alternatively, it can be powered by any 12V DC source that can supply at least 100mA through a 5.5mm\/2.1mm tip-positive plug. Store the astrograph in a cool area and keep it outside for an hour or so before imaging, then unplug the battery pack to turn the fan off when you are ready to image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCollimation and Camera Rotation for Pinpoint Stars\u003c\/h3\u003e\n\u003cp\u003eWhile the RASA 8 optics are aligned at the factory, provisions exist for fine-tuning collimation if necessary. Adjustments are made to the tilt of the front lens group, not the primary mirror or corrector. To check collimation, you point the telescope at a bright star, defocus the image, and inspect the resulting \"donut\" pattern. A perfectly collimated system will show a concentric pattern.\u003c\/p\u003e\n\u003cp\u003eAdjustments are made using three pairs of push-pull screws on the lens group cell, which are reached through the three slotted openings in the camera adapter, using 3mm and 2mm hex keys with a camera installed. Camera orientation can also be easily adjusted. Simply loosen the main retaining ring by no more than 1\/8th of a turn, rotate your camera to the desired framing, and gently retighten the ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 17 lb OTA and CGE Dovetail Bar\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 optical tube assembly weighs only 17 lbs (7.7 kg), making it an easy payload for a wide range of equatorial mounts. Its physical dimensions are also manageable, with an optical tube length of 628mm (24.7\") and a diameter of 235mm (9.3\").\u003c\/p\u003e\n\u003cp\u003eIt comes equipped with a wide CGE-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. This format is also compatible with mounts that accept Losmandy-D style plates. The astrograph weighs 17 lb, so a mount with a load capacity greater than that is required for good performance once a camera and accessories are added. The included CGE dovetail accessory bar can carry an optional \u003ca href=\"\/collections\/autoguiding\"\u003eguidescope\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIncluded \u0026amp; Optional Accessories: What's in the Box and What to Add\u003c\/h3\u003e\n\u003cp\u003eThe RASA 8 optical tube assembly includes the essential adapters to get you started with common astronomical cameras. The box contains the main optical tube, a 42mm T-thread camera adapter, a C-thread camera adapter, a retaining ring for securing them, and a battery pack for the cooling fan.\u003c\/p\u003e\n\u003cp\u003eTo complete your imaging setup, several optional accessories are available from Celestron:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Adapters:\u003c\/strong\u003e Specific adapters for Canon and Sony mirrorless cameras are available to ensure correct back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCelestron Focus Motor:\u003c\/strong\u003e Allows for precise, remote-controlled focusing from your computer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Pollution Filter:\u003c\/strong\u003e Mounts directly into the RASA 8's optical path in place of the optical window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8\" Dew Shield:\u003c\/strong\u003e The easiest way to prevent dew on the Schmidt corrector; a \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew heater\u003c\/a\u003e can be added in more severe conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSolar Warning:\u003c\/strong\u003e Never look directly at the Sun with the naked eye or with an optic (unless you have the proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Celestron RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optical tube weighs \u003cstrong\u003e17 lbs (7.7 kg)\u003c\/strong\u003e. A mount with a load capacity greater than that is required to ensure good performance once a camera and accessories are added. The CGE dovetail bar fits mounts that accept a CGE or Losmandy-D style dovetail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my DSLR camera with the RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The RASA 8 is not compatible with DSLR cameras. The camera body is too large and would obstruct a significant portion of the telescope's 203mm aperture. Additionally, the long back focus of DSLRs prevents the sensor from being placed at the required 29mm focal plane. The RASA 8 is designed specifically for smaller-bodied astronomical CMOS\/CCD cameras and mirrorless cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs autoguiding necessary with the RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOften it is not. Because shorter exposure times are possible at \u003cstrong\u003ef\/2.0\u003c\/strong\u003e, and the short \u003cstrong\u003e400mm focal length\u003c\/strong\u003e lessens tracking demands, autoguiding will not be required in many cases.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy can't I use the RASA 8 for visual observing with an eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RASA 8 is a dedicated astrograph designed purely for imaging. Its focal plane is located at the front of the optical tube where the camera is mounted. There is no provision to insert a \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e or eyepiece into the light path, so visual observation is not possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate the right back focus spacing for my camera on the RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RASA 8 requires a specific distance from the mounting surface to the camera sensor. If you use the included \u003cstrong\u003eM42 T-thread adapter\u003c\/strong\u003e, this distance is \u003cstrong\u003e25mm\u003c\/strong\u003e. You must add extension tubes to make up the difference. For example, if your camera has a native back focus of 17.5mm, you would need to add 7.5mm of M42 extension rings (25mm - 17.5mm = 7.5mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the 22mm optimized and 32mm usable image circles on the RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e22mm optimized image circle\u003c\/strong\u003e is the area where optical performance is highest, delivering spot sizes under 2.3 μm RMS for pinpoint stars. The \u003cstrong\u003e32mm useable field\u003c\/strong\u003e extends this to accommodate larger sensors, like APS-C, with only minimal performance loss and slight vignetting at the very edges of the frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the RASA 8 for imaging planets like Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile possible, it is not ideal. The RASA 8 is a wide-field instrument with a short \u003cstrong\u003e400mm focal length\u003c\/strong\u003e, which will result in a very small image scale for planets. The RASA 8 is designed for wide-field deep-sky imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I remove the RASA 8's optical window?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, in most cases. Remove the \u003cstrong\u003e46mm optical window\u003c\/strong\u003e if your camera has its own protective window or if you plan to use any filter in the light path. Removing it maintains the best optical performance. Store the window carefully in a safe, dust-free place.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a dew shield necessary for the RASA 8?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn optional 8\" dew shield is the easiest way to prevent dew: the Schmidt corrector is exposed to the night sky, and if the astrograph drops below the dew point, dew can form within minutes. In more severe conditions, a dew heater can apply slight heat to keep the corrector dry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the included M42 and C-mount adapters for the RASA 8 let me do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese two adapters allow you to connect a wide variety of dedicated \u003ca href=\"\/collections\/cameras\"\u003eastronomy cameras\u003c\/a\u003e. The \u003cstrong\u003eM42x0.75 (T-thread) adapter\u003c\/strong\u003e is a common standard for many CMOS and CCD cameras. The \u003cstrong\u003eC-thread adapter\u003c\/strong\u003e fits any camera with a standard C-thread; if the camera's sensor spacing meets the C-thread standard (17.5mm back focus), no additional adapters are needed. With the M42 adapter, M42 extension rings are usually needed to reach 25mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e203mm (8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400mm (15.74\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e22mm (.86\") Ø, 3.15°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable Field\u003c\/td\u003e\n\u003ctd\u003e32mm (1.26\") Ø, 4.6°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot Size\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 2.3 μm RMS across image circle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Obstruction Diameter\u003c\/td\u003e\n\u003ctd\u003e93mm (3.66\") (46% of aperture)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e843x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.68 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e400 - 800 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (with included adapter)\u003c\/td\u003e\n\u003ctd\u003e25mm (.98\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (from threaded collar)\u003c\/td\u003e\n\u003ctd\u003e29mm (1.14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e628mm (24.7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e235mm (9.3\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e17 lbs (7.7 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003ePrecision Bearing System (PBS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFeatures\u003c\/td\u003e\n\u003ctd\u003eAir-cooling system, integrated filter mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Male (included T-thread adapter), C-mount Male (included C-thread adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003eSchmidt corrector, primary mirror, lens group, removable 46mm optical window\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8\" RASA Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e42mm T-thread Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eC-thread Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRetaining Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFan Battery Pack\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Rowe-Ackermann_Schmidt_Astrograph_8_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload RASA 8 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-RASA-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7\n.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload RASA Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967155597597,"sku":"CEL-91073","price":3057.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-8-inch-Rowe-Ackermann-Schmidt-Astrograph-RASA-8-Optical-Tube-Assembly-CGE-Dovetail-91073-1__83690.1594229272.1280.1280.jpg?v=1684337464"},{"product_id":"celestron-c11-ota-cge-dovetail","title":"Celestron C11 OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e279.4mm (11\") Schmidt-Cassegrain Optical Tube Assembly\u003c\/li\u003e\n\u003cli\u003e2800mm Focal Length at an f\/10 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e0.42 arc seconds Dawes Limit Resolution\u003c\/li\u003e\n\u003cli\u003eStarBright XLT High-Transmission Optical Coatings\u003c\/li\u003e\n\u003cli\u003eFastar-compatible for f\/2 wide-field imaging\u003c\/li\u003e\n\u003cli\u003eWeighs 27.5 lbs and includes a CGE dovetail bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron C11 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron C11 XLT is a 279.4mm (11\") f\/10 Schmidt-Cassegrain optical tube with StarBright XLT coatings and a CGE \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. The C11 packs serious light gathering ability into a rugged aluminum tube that, at 24 inches and 27.5 lbs, is still portable enough to be taken to dark skies and set up by a single person, and is an ideal instrument for serious astrophotography that provides excellent, high-contrast views and can perform at very high magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e11\" Schmidt-Cassegrain Optics: 2800mm at f\/10\u003c\/h3\u003e\n      \u003cp\u003eCelestron's SCT manual describes the Schmidt-Cassegrain as a compound, or catadioptric, telescope: a zero power corrector plate, a spherical primary mirror and a secondary mirror, with light travelling the length of the tube three times. The design offers large-diameter optics in very short tube lengths, which makes the tubes extremely portable.\u003c\/p\u003e\n      \u003cp\u003eThe 279.4mm aperture and 2800mm focal length give 1593x the light gathering power of the eye, a limiting stellar magnitude of 14.7 and a resolution of 0.5 arc seconds (Rayleigh) or 0.42 arc seconds (Dawes). The secondary obstruction is 95mm (3.75\"), 34% by diameter and 12% by area.\u003c\/p\u003e\n      \u003cp\u003eThe aluminum tube is 610mm (24\") long and 312.42mm (12.4\") in diameter and weighs 27.5 lbs (12.4 kg).\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStarBright XLT Coatings\u003c\/h3\u003e\n      \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n      \u003cp\u003eStarBright XLT visibly increases contrast and light transmission, so you can discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eVisual Setup: Visual Back, Diagonal, Eyepiece and Finder\u003c\/h3\u003e\n      \u003cp\u003eThe visual back comes on the rear cell; a 40mm 1.25\" eyepiece, the 1.25\" star diagonal and a 9x50 finderscope with bracket are included. The diagonal slides into the visual back and the eyepiece into the diagonal, each held by a set screw, and loosening the visual back's set screw lets you rotate the diagonal.\u003c\/p\u003e\n      \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n      \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocusing and Magnification\u003c\/h3\u003e\n      \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n      \u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's, 2800mm here. The general rule allows 60 power per inch of aperture as the highest useful magnification, 660x for this tube, with most observing done at 20 to 35 power per inch, or about 220x to 385x. The included 40mm eyepiece gives 70x, and the lowest useful magnification is 40x.\u003c\/p\u003e\n      \u003cp\u003eTo find the true field of view, divide the eyepiece's apparent field by the magnification. The longer an eyepiece's focal length, the lower its magnification, and you will generally use low-to-moderate power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eImaging: Fastar and More\u003c\/h3\u003e\n      \u003cp\u003eThe 11\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n      \u003cp\u003ePairing the C11 with the optional f\/6.3 \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efocal reducer\u003c\/a\u003e also opens more astroimaging options; the available ratios are f\/2 with the Fastar lens assembly, f\/6.3 with the reducer\/corrector, f\/10 native and f\/20 with an optional 2x \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCare and Collimation\u003c\/h3\u003e\n      \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n      \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone. Before checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 40mm eyepiece gives 70x (2800mm \/ 40mm). The highest useful magnification is 660x and the lowest is 40x.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the C11 XLT Fastar compatible?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 11\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the image look reversed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I align the finderscope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the finder, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep the corrector clean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical cleaning solution and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the tube need collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow long should the tube cool before collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e279.4mm (11\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2800mm (110\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.5 arc seconds (Rayleigh), 0.42 arc seconds (Dawes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e1593x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e660x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e40x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e95mm (3.75\"); 34% by diameter, 12% by area\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e40mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Magnification\u003c\/td\u003e\n\u003ctd\u003e70x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e610mm (24\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e312.42mm (12.4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e27.5 lbs (12.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eSCT 2\"-24 Male (on rear reducer plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching flattener \/ reducer\u003c\/td\u003e\n\u003ctd\u003eCelestron f\/6.3 focal reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCelestron 11\" Schmidt-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVisual Back\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e40mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Advanced_Series_SCT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 9\n6 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron SCT Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967157072157,"sku":"CEL-91036-XLT","price":4587.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-C11-Optical-Tube-Assembly-CGE-Dovetail-91036-XLT-1__81410.1594230345.1280.1280.jpg?v=1684337646"},{"product_id":"celestron-c14-ota-cge-dovetail","title":"Celestron C14 OTA - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e355.5mm (14\") Schmidt-Cassegrain Optical Tube Assembly\u003c\/li\u003e\n\u003cli\u003e3910mm Focal Length at f\/11\u003c\/li\u003e\n\u003cli\u003eDawes Limit Resolution of 0.33 Arc Seconds\u003c\/li\u003e\n\u003cli\u003e2581x Light Gathering Power Compared to the Human Eye\u003c\/li\u003e\n\u003cli\u003eFastar Compatible for f\/2 Wide-Field Imaging\u003c\/li\u003e\n\u003cli\u003eWeighs 46 lbs and includes a CGE Dovetail Bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron C14 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron C14 XLT is a 355.5mm (14\") f\/11 Schmidt-Cassegrain optical tube with StarBright XLT coatings and an attached CGE dovetail bar. This world-class, observatory-ready instrument is the largest in its class, with over three times the light gathering power of an 8\" telescope, and an ideal instrument for serious astrophotography that provides high-contrast views even at very high magnifications. It gathers 2581 times more light than the eye and resolves 0.33 arc seconds (Dawes).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e14\" Schmidt-Cassegrain Optics: 3910mm at f\/11\u003c\/h3\u003e\n      \u003cp\u003eCelestron's SCT manual describes the Schmidt-Cassegrain as a compound, or catadioptric, telescope: a zero power corrector plate, a spherical primary mirror and a secondary mirror, with light travelling the length of the tube three times. The design offers large-diameter optics in very short tube lengths, which makes the tubes extremely portable.\u003c\/p\u003e\n      \u003cp\u003eThe 355.5mm aperture and 3910mm focal length give 2581x the light gathering power of the eye, a limiting stellar magnitude of 15.3 and a resolution of 0.39 arc seconds (Rayleigh) or 0.33 arc seconds (Dawes). The secondary obstruction is 114mm (4.5\"), 32% by diameter and 10% by area.\u003c\/p\u003e\n      \u003cp\u003eThe aluminum tube is 787mm (31\") long and 400.5mm (15.77\") in diameter and weighs 46 lbs (21 kg). With this tube you can see amazing detail on the surface of Jupiter, resolve details on the surface of Mars, see Cassini's Division in the rings of Saturn, and even the distant planets Uranus and Neptune.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStarBright XLT Coatings\u003c\/h3\u003e\n      \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n      \u003cp\u003eStarBright XLT visibly increases contrast and light transmission for brighter deep space images and shorter exposure times.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eVisual Setup: 2\" Mirror Diagonal, Eyepiece and Finder\u003c\/h3\u003e\n      \u003cp\u003eInstead of a \u003ca href=\"\/collections\/visual-adapters\"\u003evisual back\u003c\/a\u003e, the C14 comes with a 2\" mirror star diagonal that threads directly onto the rear of the tube, with a 1.25\" eyepiece adapter. A 40mm 2\" eyepiece, a 9x50 finderscope with bracket and front and rear dust caps are included, and the CGE dovetail bar comes attached.\u003c\/p\u003e\n      \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n      \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocusing, Mirror Locks and Magnification\u003c\/h3\u003e\n      \u003cp\u003eBefore turning the focus knob on the C14, loosen the two mirror locking knobs on the rear cell. They connect a screw to the primary mirror mounting plate and stop the mirror moving when locked down, so lock them when transporting the telescope.\u003c\/p\u003e\n      \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n      \u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's, 3910mm here. The general rule allows 60 power per inch of aperture as the highest useful magnification, 840x for this tube, with most observing done at 20 to 35 power per inch, or about 280x to 490x. The included 40mm eyepiece gives 98x, and the lowest useful magnification is 51x.\u003c\/p\u003e\n      \u003cp\u003eTo find the true field of view, divide the eyepiece's apparent field by the magnification. The longer an eyepiece's focal length, the lower its magnification, and you will generally use low-to-moderate power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eImaging: Fastar and the f\/6.3 Reducer\u003c\/h3\u003e\n      \u003cp\u003eThe C14 is Fastar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Exposures are then 25 times shorter than at the native f\/11 focus. The C14's focal length is 3910mm at f\/11, 2239mm with the optional f\/6.3 \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003ereducer\/corrector\u003c\/a\u003e and 746mm at f\/2 with the Fastar lens assembly, and the secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n      \u003cp\u003ePairing the C14 with the optional f\/6.3 focal reducer also opens more astroimaging options.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCare and Collimation\u003c\/h3\u003e\n      \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n      \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone. Before checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 40mm eyepiece gives 98x (3910mm \/ 40mm). The highest useful magnification is 840x and the lowest is 51x.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I see with the C14?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith this tube you can see amazing detail on the surface of Jupiter, resolve details on the surface of Mars, see Cassini's Division in the rings of Saturn, and even the distant planets Uranus and Neptune.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the knobs on the rear cell?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore turning the focus knob on the C14, loosen the two mirror locking knobs on the rear cell. They connect a screw to the primary mirror mounting plate and stop the mirror moving when locked down, so lock them when transporting the telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the C14 Fastar compatible?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe C14 is Fastar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Exposures are then 25 times shorter than at the native f\/11 focus. The C14's focal length is 3910mm at f\/11, 2239mm with the optional f\/6.3 reducer\/corrector and 746mm at f\/2 with the Fastar lens assembly, and the secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the image look reversed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I align the finderscope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the finder, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep the corrector clean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical cleaning solution and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the C14 need collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow long should the tube cool before collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e355.5mm (14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3910mm (154\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.33 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.39 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e2581x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e15.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e840x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e51x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFastar Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e114mm (4.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e32%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e10%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e787mm (31\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e400.5mm (15.77\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e46 lbs (21 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e40mm (98x Magnification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Star Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" with 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching flattener \/ reducer\u003c\/td\u003e\n\u003ctd\u003ef\/6.3 reducer\/corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eC14 Schmidt-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCGE Dovetail Bar (Attached)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Mirror Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e40mm Eyepiece (2\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront and Rear Dust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Advanced_Series_SCT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-1\n0.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron SCT Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967157170461,"sku":"CEL-91038-XLT","price":9452.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-C14-Optical-Tube-Assembly-CGE-Dovetail-91038-XLT-1__60776.1594230346.1280.1280.jpg?v=1684337652"},{"product_id":"celestron-c6-ota-cg-5-dovetail","title":"Celestron C6 OTA  - CG-5 Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e150mm (6\") Schmidt-Cassegrain Optical Tube Assembly\u003c\/li\u003e\n\u003cli\u003e1500mm Focal Length (f\/10)\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003e10 lbs (4.54 kg) Optical Tube Weight\u003c\/li\u003e\n\u003cli\u003eCG-5 Dovetail Bar for Mount Compatibility\u003c\/li\u003e\n\u003cli\u003eIncludes 6x30 Finderscope, 1.25\" Diagonal, and 25mm Eyepiece (60x)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron C6 OTA - CG-5 Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron C6 XLT is a 150mm (6\") f\/10 Schmidt-Cassegrain optical tube with StarBright XLT coatings and a CG-5 \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. It is a great multi-use optical tube with the best balance of portability, handling ease and light gathering ability, an advanced level instrument that is as easy to use as any intermediate level, and most entry level, telescopes. The tube weighs 10 lbs and comes with a 25mm eyepiece, a 6x30 finderscope and a 1.25\" star diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e150mm f\/10 Schmidt-Cassegrain Optics\u003c\/h3\u003e\n      \u003cp\u003eThe C6 offers 40% more light gathering than a 5\" Cassegrain telescope. The Schmidt-Cassegrain is a compound, or catadioptric, telescope: a zero power corrector plate, a spherical primary mirror and a secondary mirror, with light travelling the length of the tube three times. The design offers large-diameter optics in very short tube lengths, which makes the tubes extremely portable.\u003c\/p\u003e\n      \u003cp\u003eThe 150mm aperture and 1500mm focal length give 459x the light gathering power of the eye, a limiting stellar magnitude of 13.4 and a resolution of 0.93 arc seconds (Rayleigh) or 0.77 arc seconds (Dawes). The secondary obstruction is 56mm (2.2\"), 37% by diameter and 14% by area.\u003c\/p\u003e\n      \u003cp\u003eThe tube is 406mm (16\") long and 180mm (7.12\") in diameter and weighs 10 lbs (4.54 kg). The rear has a male SCT (2\"-24tpi) thread, and focusing moves the primary mirror.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStarBright XLT Coatings\u003c\/h3\u003e\n      \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n      \u003cp\u003eStarBright XLT visibly increases contrast and light transmission, so you can discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMounting, Eyepiece and Focusing\u003c\/h3\u003e\n      \u003cp\u003eThe C6 can go on a multitude of \u003ca href=\"\/collections\/computerized-telescopes\"\u003ecomputerized telescope\u003c\/a\u003e mounts thanks to its CG-5 dovetail bar, and also works well on a basic manual \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealtazimuth mount\u003c\/a\u003e for night sky viewing or as a terrestrial \u003ca href=\"\/collections\/spotting-scopes\"\u003espotting scope\u003c\/a\u003e during the day.\u003c\/p\u003e\n      \u003cp\u003eThe included 25mm eyepiece gives 60x; the highest useful magnification is 354x and the lowest is 21x. A 6x30 finderscope with bracket, a 1.25\" star diagonal and front and rear dust caps are included.\u003c\/p\u003e\n      \u003cp\u003eFocusing moves the primary mirror, using the focus knob on the rear cell. Celestron's SCT manual advises making the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and starting on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n      \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the \u003ca href=\"\/collections\/visual-adapters\"\u003evisual back\u003c\/a\u003e, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design. To find the true field of view, divide the eyepiece's apparent field by the magnification. The longer an eyepiece's focal length, the lower its magnification, and you will generally use low-to-moderate power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCare and Collimation\u003c\/h3\u003e\n      \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department.\u003c\/p\u003e\n      \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone. Before checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 25mm eyepiece gives 60x (1500mm \/ 25mm). The highest useful magnification is 354x and the lowest is 21x.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich mounts can carry the C6?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt fits a multitude of computerized telescope mounts thanks to its CG-5 dovetail bar, and also works well on a basic manual altazimuth mount, for night sky viewing or as a terrestrial spotting scope during the day. The tube weighs 10 lbs.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the StarBright XLT coatings do?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the C6?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFocusing moves the primary mirror, using the focus knob on the rear cell. Celestron's SCT manual advises making the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and starting on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the image look reversed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep the corrector clean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical cleaning solution and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the C6 need collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow long should the tube cool before collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat threads are on the back?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe rear cell has a male SCT (2\"-24tpi) thread; the 1.25\" star diagonal and 25mm eyepiece are included.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e150mm (6\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1500mm (59\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e354x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e21x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e13.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.93 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.77 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e459x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e56mm (2.2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e37%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction by Area\u003c\/td\u003e\n\u003ctd\u003e14%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e406mm (16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e180mm (7.12\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.54 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCG-5 Dovetail bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e25mm (60x Magnification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finderscope\u003c\/td\u003e\n\u003ctd\u003e6x30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Star Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eSCT (2\"-24tpi) Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eMoving primary mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eC6 Schmidt-Cassegrain Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e6x30 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e25mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront and Rear Dust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Advanced_Series_SCT_Manual.pdf?v=1782176435\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron SCT Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967157301533,"sku":"CEL-91010-XLT","price":1223.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-C6-Optical-Tube-Assembly-CG-5-Dovetail-91010-XLT-1__39491.1594230348.1280.1280.jpg?v=1684337566"},{"product_id":"celestron-c8-ota-cge-dovetail","title":"Celestron C8 OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e203.2mm (8\") Schmidt-Cassegrain Optical Tube Assembly\u003c\/li\u003e\n\u003cli\u003e2032mm Focal Length at a f\/10 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003eFastar-Compatible for f\/2 Wide-Field Imaging\u003c\/li\u003e\n\u003cli\u003eWeighs only 12.5 lbs and includes a CGE Dovetail Bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron C8 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron C8 XLT is a 203.2mm (8\") f\/10 Schmidt-Cassegrain optical tube with StarBright XLT coatings and a CGE \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. This is the direct, but much improved, descendant of the revolutionary C8 that transformed the hobby of astronomy, and this compact tube provides the best balance of portability, handling ease and light gathering ability. It weighs 12.5 lbs and has the added versatility of Fastar.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e8\" Schmidt-Cassegrain Optics: 2032mm at f\/10\u003c\/h3\u003e\n      \u003cp\u003eCelestron's SCT manual describes the Schmidt-Cassegrain as a compound, or catadioptric, telescope: a zero power corrector plate, a spherical primary mirror and a secondary mirror, with light travelling the length of the tube three times. The design offers large-diameter optics in very short tube lengths, which makes the tubes extremely portable.\u003c\/p\u003e\n      \u003cp\u003eThe 203.2mm aperture and 2032mm focal length give 843x the light gathering power of the eye, a limiting stellar magnitude of 14 and a resolution of 0.69 arc seconds (Rayleigh) or 0.57 arc seconds (Dawes). The secondary obstruction is 64mm (2.5\"), 31% by diameter and 9.77% by area.\u003c\/p\u003e\n      \u003cp\u003eThe aluminum tube is 432mm (17\") long and 238mm (9.37\") in diameter and weighs 12.5 lbs (5.67 kg).\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStarBright XLT Coatings\u003c\/h3\u003e\n      \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n      \u003cp\u003eStarBright XLT visibly increases contrast and light transmission, so you can discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eVisual Setup: Visual Back, Diagonal, Eyepiece and Finder\u003c\/h3\u003e\n      \u003cp\u003eThe visual back comes installed on the rear cell; a 25mm 1.25\" eyepiece, the 1.25\" star diagonal, a 6x30 finderscope and a front lens cover are included. The diagonal slides into the visual back and the eyepiece into the diagonal, each held by a set screw, and loosening the visual back's set screw lets you rotate the diagonal.\u003c\/p\u003e\n      \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n      \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocusing and Magnification\u003c\/h3\u003e\n      \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n      \u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's, 2032mm here. The general rule allows 60 power per inch of aperture as the highest useful magnification, 480x for this tube, with most observing done at 20 to 35 power per inch, or about 160x to 280x. The included 25mm eyepiece gives 81x, and the lowest useful magnification is 29x.\u003c\/p\u003e\n      \u003cp\u003eTo find the true field of view, divide the eyepiece's apparent field by the magnification. The longer an eyepiece's focal length, the lower its magnification, and you will generally use low-to-moderate power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eImaging: Fastar and More\u003c\/h3\u003e\n      \u003cp\u003eThe 8\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCare and Collimation\u003c\/h3\u003e\n      \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n      \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone. Before checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 25mm eyepiece gives 81x (2032mm \/ 25mm). The highest useful magnification is 480x and the lowest is 29x.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the C8 XLT Fastar compatible?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 8\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the image look reversed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I align the finderscope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the finder, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep the corrector clean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical cleaning solution and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the tube need collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow long should the tube cool before collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e203.2mm (8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2032mm (80\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e843x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e480x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e29x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.69 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e64mm (2.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e31%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e9.77%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e25mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Magnification\u003c\/td\u003e\n\u003ctd\u003e81x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e6x30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e432mm (17\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e238mm (9.37\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e12.5 lbs (5.67 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eSCT 2\"-24tpi Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003eSchmidt corrector (water white glass), spherical primary mirror, secondary mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eC8 Schmidt-Cassegrain Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVisual Back\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e25mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e6x30 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront Lens Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Advanced_Series_SCT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron SCT Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C\n8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967157367069,"sku":"CEL-91024-XLT","price":1946.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-C8-Optical-Tube-Assembly-CGE-Dovetail-91024-XLT-1__90512.1594230350.1280.1280.jpg?v=1684337582"},{"product_id":"celestron-c9-25-ota-cge-dovetail","title":"Celestron C9.25 OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e235mm (9.25\") Schmidt-Cassegrain Optical Tube\u003c\/li\u003e\n\u003cli\u003e2350mm Focal Length (f\/10)\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003e0.49 Arc Second Dawes Resolution\u003c\/li\u003e\n\u003cli\u003eFastar-Compatible for f\/2 Imaging\u003c\/li\u003e\n\u003cli\u003e20 lb Optical Tube Weight\u003c\/li\u003e\n\u003cli\u003eCGE Dovetail Bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron C9.25 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron C9.25 XLT is a 235mm (9.25\") f\/10 Schmidt-Cassegrain optical tube with StarBright XLT coatings and a CGE \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. Many consider the C9.25 the Goldilocks of optical tubes, not too big and not too small, with the best balance of portability, handling ease and light gathering ability. The tube is only 22 inches long, weighs 20 lbs and has the added versatility of Fastar.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e9.25\" Schmidt-Cassegrain Optics: 2350mm at f\/10\u003c\/h3\u003e\n      \u003cp\u003eCelestron's SCT manual describes the Schmidt-Cassegrain as a compound, or catadioptric, telescope: a zero power corrector plate, a spherical primary mirror and a secondary mirror, with light travelling the length of the tube three times. The design offers large-diameter optics in very short tube lengths, which makes the tubes extremely portable.\u003c\/p\u003e\n      \u003cp\u003eThe 235mm aperture and 2350mm focal length give 1127x the light gathering power of the eye, a limiting stellar magnitude of 14.4 and a resolution of 0.59 arc seconds (Rayleigh) or 0.49 arc seconds (Dawes). The secondary obstruction is 85mm (3.35\"), 36% by diameter and 13% by area.\u003c\/p\u003e\n      \u003cp\u003eThe aluminum tube is 559mm (22\") long and 271.78mm (10.7\") in diameter and weighs 20 lbs (9.07 kg).\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStarBright XLT Coatings\u003c\/h3\u003e\n      \u003cp\u003eStarBright XLT is Celestron's coating system, built from three parts: enhanced multi-layer mirror coatings of aluminum, SiO2 and TiO2, with reflectivity fairly flat across the spectrum for both imaging and visual use; multi-layer anti-reflective coatings of magnesium fluoride and hafnium dioxide; and water white glass instead of soda lime glass for the corrector. Water white glass transmits about 90.5% of light uncoated, 3.5% more than soda lime glass, and reaches an average transmission of 97.4% with the StarBright XLT anti-reflective coatings.\u003c\/p\u003e\n      \u003cp\u003eStarBright XLT visibly increases contrast and light transmission, so you can discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eVisual Setup: Visual Back, Diagonal, Eyepiece and Finder\u003c\/h3\u003e\n      \u003cp\u003eCelestron's SCT manual says the 9.25\" tube comes with its visual back installed; a 25mm 1.25\" eyepiece, the 1.25\" star diagonal, a 6x30 finderscope and front and rear dust caps are included. The diagonal slides into the visual back and the eyepiece into the diagonal, each held by a set screw, and loosening the visual back's set screw lets you rotate the diagonal.\u003c\/p\u003e\n      \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n      \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocusing and Magnification\u003c\/h3\u003e\n      \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n      \u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's, 2350mm here. The general rule allows 60 power per inch of aperture as the highest useful magnification, 555x for this tube, with most observing done at 20 to 35 power per inch, or about 185x to 324x. The included 25mm eyepiece gives 94x, and the lowest useful magnification is 34x.\u003c\/p\u003e\n      \u003cp\u003eTo find the true field of view, divide the eyepiece's apparent field by the magnification. The longer an eyepiece's focal length, the lower its magnification, and you will generally use low-to-moderate power.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eImaging: Fastar and More\u003c\/h3\u003e\n      \u003cp\u003eThe 9.25\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCare and Collimation\u003c\/h3\u003e\n      \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical \u003ca href=\"\/collections\/cleaning-supplies\"\u003ecleaning solution\u003c\/a\u003e and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n      \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone. Before checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 25mm eyepiece gives 94x (2350mm \/ 25mm). The highest useful magnification is 555x and the lowest is 34x.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the C9.25 XLT Fastar compatible?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 9.25\" tube is Fastar\/HyperStar compatible: the secondary mirror can be removed and replaced with a lens assembly, sold separately and not included, so that a camera works at the f\/2 focus of the primary mirror at the front of the telescope. Celestron's SCT manual says f\/2 needs exposures about 25 times shorter than f\/10, with a field of view 5 times larger and the object 1\/5 the size. The secondary mirror should never be removed except to install the Fastar lens assembly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the image look reversed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith the star diagonal, the image is right-side-up but reversed left-to-right; with the eyepiece straight in the visual back, it is upside-down and reversed. This is normal for the Schmidt-Cassegrain design.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFocusing moves the primary mirror, which slides on the primary baffle tube; the focus knob sits on the rear cell just below the star diagonal, and it takes about 30 turns to go from close focus to infinity. Make the final focus turn counterclockwise so the mirror moves against gravity, which minimizes any mirror shift, and start on a bright object such as the Moon or a planet, since out-of-focus stars are very diffuse.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I align the finderscope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe finder bracket screws to the two holes in the rear cell, with its rings over the tube, and three nylon-tipped thumbscrews hold the finder, which has a cross-hair reticle. Align it in the daytime on a target more than a mile away, using the screws on the right and top of the bracket; the straight-through view is inverted, which is normal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I keep the corrector clean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eDust on the corrector can be removed with a camel hair brush or pressurized air, then an optical cleaning solution and white tissue. Dew on the corrector can be cleared with a hair dryer on a low setting or by pointing the telescope at the ground until it evaporates. Internal cleaning and adjustments should be done only by Celestron's repair department. Since the rear cell is not sealed, keep its cover on when the telescope is not in use. If moisture condenses on the inside of the corrector, remove the accessories from the rear cell and leave the telescope pointing down in a dust-free place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the tube need collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCelestron collimates every telescope at the factory and checks it before shipping. If it is jarred in transport, you can adjust the tilt of the secondary mirror with the three collimation screws on the secondary housing, the only adjustment available to the user. To check, defocus a star at least 20 degrees above the horizon with a high-power eyepiece: the dark shadow of the secondary should sit centered in the bright rings on both sides of focus. If you are unsure whether it needs adjustment, it is likely fine and best left alone.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow long should the tube cool before collimating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBefore checking collimation, let the telescope reach thermal equilibrium with its surroundings, allowing 45 minutes if you move it between large temperature extremes, such as from a heated house into the cold night air.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSchmidt-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e235mm (9.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2350mm (93\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e555x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e34x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.59 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e1127x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e85mm (3.35\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e36%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e559mm (22\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e20 lbs (9.07 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e25mm (94x Magnification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e6x30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e271.78mm (10.7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eMoving primary mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear connection\u003c\/td\u003e\n\u003ctd\u003eSCT (2\"-24tpi) Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9.25\" Schmidt-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e25mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e6x30 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront and Rear Dust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_Advanced_Series_SCT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron SCT Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Telescope Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967157432605,"sku":"CEL-91027-XLT","price":2780.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-C9-25-Optical-Tube-Assembly-CGE-Dovetail-91027-XLT-1__27091.1594230352.1280.1280.jpg?v=1684337588"},{"product_id":"celestron-edgehd-11-ota-cge-dovetail","title":"Celestron EdgeHD 11\" OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e279.4mm (11\") EdgeHD Aplanatic Optics\u003c\/li\u003e\n\u003cli\u003e2800mm Focal Length (f\/10)\u003c\/li\u003e\n\u003cli\u003e42mm Flat-Field Image Circle\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003e28 lb Optical Tube Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron EdgeHD 11\" OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron EdgeHD 11\" Optical Tube Assembly combines a massive 279.4mm aperture with a 2800mm focal length for deep-sky and planetary observing and imaging. Its aplanatic, flat-field optics achieve a Dawes limit resolution of 0.42 arc seconds, while its light-gathering power is 1593 times that of the human eye. EdgeHD produces aberration-free images across a wide visual and photographic field, with a flat 42mm diameter field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEdgeHD Optics: A 0.42 Arc Second, Flat-Field Aplanatic System\u003c\/h3\u003e\n\u003cp\u003eThe core of the EdgeHD 11\" is its aplanatic, flat-field \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e optical system, designed to reduce more than off-axis star coma: it also gives an astrograph-quality flat focal plane all the way to the edge of the field. Many designs sold as \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrographs\u003c\/a\u003e only form pinpoint stars on a curved focal plane, so stars look out of focus at the edge of a flat camera sensor; EdgeHD's focal plane is more than three times flatter than a standard Schmidt-Cassegrain.\u003c\/p\u003e\n\u003cp\u003eDawes resolution is 0.42 arc seconds. Superior edge performance not only creates rounder stars but improves resolution and limiting magnitude compared with telescopes of equal aperture, and every EdgeHD should resolve double stars to the Dawes limit, show subtle shadings in Jupiter's belts and reveal the Cassini Division in Saturn's rings. Every optical surface is treated with Celestron's premium StarBright XLT coatings, for maximum light throughput across the visual and photographic spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e11-Inch Aperture: 1593x Light Gathering and 14.7 Limiting Magnitude\u003c\/h3\u003e\n\u003cp\u003eThe 279.4mm (11\") primary mirror gathers 1593 times as much light as the unaided human eye. The limiting stellar magnitude is 14.7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Versatility: Native f\/10, Reducer and Fastar f\/2\u003c\/h3\u003e\n\u003cp\u003eAt its native f\/10, you get the image scale to capture the smallest deep-sky objects. The optional five-element 0.7x reducer lens for the EdgeHD 1100 (#94241) widens the field without sacrificing optical performance and attaches to the 3.290\"x16 tpi rear thread, and a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e adds power for high-resolution planetary, lunar and solar imaging.\u003c\/p\u003e\n\u003cp\u003eFor the ultimate in wide-field, short-exposure imaging, all EdgeHD optical tubes are Fastar-compatible. The secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAstrograph-Grade Mechanics: Mirror Clutches and Cooling Vents\u003c\/h3\u003e\n\u003cp\u003eCelestron redesigned the mechanical systems of the EdgeHD to meet the demands of long-exposure imaging. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Tension Clutches:\u003c\/strong\u003e Flexible tension clutches hold the mirror in place and reduce image shift during long exposures. Once focused, you tighten the two mirror lock knobs, and the flexible rods hold the mirror without putting force on the mirror assembly. Loosen them before you turn the focus knob again.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Cooling Vents:\u003c\/strong\u003e The rear cell features vents with integrated 50-mesh filters that let warm air out from behind the primary mirror without letting dust in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCGE Dovetail Bar:\u003c\/strong\u003e The tube comes on a CGE dovetail bar.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Superb Visual Instrument: 660x Useful Magnification\u003c\/h3\u003e\n\u003cp\u003eEdgeHD gives aberration-free images across a wide visual field too. On deep-sky objects, viewed with a high-quality eyepiece, star images appear sharp and well defined to the edge of the field. The highest useful magnification is 660x.\u003c\/p\u003e\n\u003cp\u003eThe telescope comes ready for visual use out of the box. It includes a 2\" star diagonal with a 1.25\" adapter for eyepiece flexibility and a 23mm eyepiece that provides 122x magnification. The included 9x50 finderscope makes locating targets straightforward, whether you are star-hopping manually or using a GoTo mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between the Celestron EdgeHD 11\" and a standard C11 OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEdgeHD is aplanatic and flat field: it reduces off-axis coma and gives a focal plane more than three times flatter than a standard Schmidt-Cassegrain, so stars stay sharp to the edge of a flat camera sensor across a 42mm field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron EdgeHD 11\" for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. EdgeHD produces aberration-free images across a wide visual and photographic field. It comes with a 2\" star diagonal with 1.25\" adapter, a 23mm eyepiece (122x) and a 9x50 finderscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the 28 lb Celestron EdgeHD 11\" OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs \u003cstrong\u003e28 lbs\u003c\/strong\u003e and comes on a CGE dovetail bar. Celestron sells the EdgeHD 11 as kits on its CGEM II, CGX and CGX-L \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e, whose dual \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddles\u003c\/a\u003e take the CGE bar.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Celestron EdgeHD 11\" cover my full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCelestron's final acceptance test checks every EdgeHD for sharp images at the center and at each corner of a full-frame (24x36mm, 42mm diagonal) camera, and the tube is designed for a flat 42mm diameter field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the mirror clutches on the EdgeHD 11\" help with astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFlexible tension clutches hold the primary mirror in place and reduce image shift during long exposures. Focus first, then turn the two mirror lock knobs clockwise until tight. Loosen them before you turn the focus knob again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is Fastar and how do I use it with the EdgeHD 11\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll EdgeHD tubes are Fastar compatible: the secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow important is thermal equilibrium for the EdgeHD 11\", and how do the vents help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCooling vents on the rear cell let warm air out from behind the primary mirror, and each has an integrated 50-mesh filter so dust stays out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for imaging with the Celestron EdgeHD 11\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EdgeHD 1100 forms its best images \u003cstrong\u003e146.05mm (5.75\")\u003c\/strong\u003e behind the rear cell's 3.290\"x16 tpi thread, within about ±0.5mm. The 0.7x reducer for the 1100 uses the same 146.05mm distance, so the same camera adapter works with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eEdgeHD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e279.4mm (11\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2800mm (110\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.5 arc seconds (Rayleigh) \/ 0.42 arc seconds (Dawes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e1593x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e660x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e40x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e95mm (3.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e34%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFastar Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e610mm (24\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e312.42mm (12.3\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e28 lbs (13 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Star Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" with 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e23mm (122x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ Camera-Side Connection\u003c\/td\u003e\n\u003ctd\u003eCelestron EdgeHD male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEdgeHD 11\" Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCGE Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVisual Back\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVisual Back Adapter Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal with 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e23mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope and Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_EdgeHD_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l\n0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-EdgeHD-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967163756829,"sku":"CEL-91050-XLT","price":6254.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-EdgeHD-11-inch-Optical-Tube-Assembly-CGE-Dovetail-91050-XLT-1__54629.1594230382.1280.1280.jpg?v=1684337852"},{"product_id":"celestron-edgehd-14-ota-cge-dovetail","title":"Celestron EdgeHD 14\" OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14\" (356mm) EdgeHD Aplanatic Schmidt-Cassegrain Optics\u003c\/li\u003e\n\u003cli\u003e3910mm Focal Length at f\/11\u003c\/li\u003e\n\u003cli\u003e42mm Flat-Field Image Circle\u003c\/li\u003e\n\u003cli\u003e0.33 Arc Second Dawes Resolution Limit\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003eFastar-Compatible for f\/2 Wide-Field Imaging\u003c\/li\u003e\n\u003cli\u003e46 lb (21 kg) Optical Tube Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron EdgeHD 14\" OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron EdgeHD 14\" OTA's 356mm (14\") aperture and 3910mm focal length (f\/11) give 2579x the light-gathering power of the human eye. Its aplanatic optical system produces aberration-free images across a flat 42mm field. With a Dawes resolution limit of 0.33 arc seconds and a limiting magnitude of 15.3, this 46 lb optical tube is engineered for high-resolution planetary and deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe EdgeHD Optical Design: A 42mm Flat-Field Astrograph\u003c\/h3\u003e\n\u003cp\u003eThe EdgeHD is an aplanatic, flat-field \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e designed to produce aberration-free images across a wide photographic field. Unlike standard SCTs, which produce sharp stars only in the center of a curved focal plane, the EdgeHD system incorporates a two-element lens group in the main baffle tube. This corrects for both off-axis coma and field curvature, producing a focal plane more than three times flatter than a standard SCT.\u003c\/p\u003e\n\u003cp\u003eThe flat focal plane keeps stars sharp to the edge of a flat camera sensor. Every EdgeHD passes a final acceptance test with a camera and an artificial star, which checks for sharp images at the center and at each corner of a full-frame (42mm diagonal) frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e356mm Aperture: 2579x Light Gathering and 0.33\" Resolution\u003c\/h3\u003e\n\u003cp\u003eThe foundation of this telescope's performance is its 356mm (14\") primary mirror. This massive aperture provides a light-gathering power 2579 times that of the unaided human eye, and the limiting stellar magnitude is 15.3.\u003c\/p\u003e\n\u003cp\u003eThe Dawes limit is 0.33 arc seconds, and every EdgeHD should resolve double stars to the Dawes limit and reveal the Cassini Division in Saturn's rings on a night of good seeing. StarBright XLT coatings on every surface give maximum light throughput.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Versatility: Native f\/11, Optional Reducer, and Fastar f\/2\u003c\/h3\u003e\n\u003cp\u003eThe EdgeHD 14\" is an exceptionally versatile imaging platform, capable of operating at three distinct focal ratios. At its native 3910mm focal length (f\/11), it gives the image scale to capture the smallest deep-sky objects. The EdgeHD 1400 forms its best images 146.05mm (5.75\") behind the 3.290\"x16 tpi rear thread.\u003c\/p\u003e\n\u003cp\u003eFor a wider perspective on larger deep-sky objects, the optional, custom-designed EdgeHD 0.7x Reducer Lens (#94240) is a five-element lens that widens the field and shortens exposures, attaching to the rear thread at the same 146.05mm back focus. All EdgeHD tubes are also Fastar compatible: the secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Precision: Mirror Clutches\u003c\/h3\u003e\n\u003cp\u003eBeyond its optics, the EdgeHD 14\" tube is mechanically optimized for long-exposure astrophotography. Flexible tension clutches hold the mirror in place and reduce image shift during long exposures. After achieving focus, you turn the two mirror lock knobs clockwise until tight, and loosen them again before refocusing.\u003c\/p\u003e\n\u003cp\u003eThese clutches hold the mirror assembly without putting force or pressure on it, keeping the image centered in the eyepiece or on the sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThermal Stability: Vented Tube for Faster Acclimation\u003c\/h3\u003e\n\u003cp\u003eA large telescope must reach thermal equilibrium with the ambient air to deliver its sharpest images. Cooling vents on the rear cell let hot air out from behind the primary mirror.\u003c\/p\u003e\n\u003cp\u003eEach vent is covered with an integrated 50-mesh filter, which allows warm air to flow out without letting dust or debris enter the optical tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the 46 lb OTA: CGE Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe EdgeHD 14\" optical tube assembly weighs 46 lbs (21 kg) and has a length of 787mm (31\"). It attaches to mounts via a CGE-style (Losmandy-D compatible) \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. Celestron sells the EdgeHD 14 as a kit on its CGX-L mount, whose dual \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e takes the CGE bar.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Observing: From 51x Wide-Field to 840x Planetary Views\u003c\/h3\u003e\n\u003cp\u003eWhile designed as an \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e, the EdgeHD 14\" is a superb visual instrument. The included 23mm eyepiece gives 170x, and the highest useful magnification is 840x.\u003c\/p\u003e\n\u003cp\u003eFor finding objects and observing large star clusters, the lowest useful magnification is 51x. The package includes a 9x50 finderscope and a 2\" star diagonal with a 1.25\" adapter. On deep-sky objects, viewed with a high-quality eyepiece, EdgeHD star images appear sharp and well defined to the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n  \u003cdiv class=\"DAV-section-center\"\u003e\n    \u003cdiv class=\"DAV-warning\"\u003e\n      \u003cp\u003e\u003cstrong\u003eSolar Warning\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp\u003eNever look directly at the Sun with the naked eye or with an optic (unless you have the proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the EdgeHD 14\" improve images over a standard 14\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key difference is the \u003cstrong\u003eflat field\u003c\/strong\u003e. A standard SCT has a curved focal plane, causing stars at the edge of a camera sensor to appear out of focus. The EdgeHD 14\" corrects for this field curvature and off-axis coma, delivering pinpoint-sharp stars across its entire 42mm image circle, which is critical for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 42mm image circle of the EdgeHD 14\" mean for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEdgeHD is designed for a flat 42mm diameter field, and Celestron's final acceptance test checks every tube for sharp images at the center and at each corner of a full-frame (24x36mm, 42mm diagonal) camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the mirror clutches on the EdgeHD 14\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFlexible tension clutches hold the primary mirror in place and reduce image shift during long exposures. Focus first, then turn the two mirror lock knobs clockwise until tight; loosen them before you turn the focus knob again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fastar compatibility work on the EdgeHD 14\" OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the 46 lb EdgeHD 14\" OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs \u003cstrong\u003e46 lbs (21 kg)\u003c\/strong\u003e and comes on a CGE dovetail bar. Celestron sells the EdgeHD 14 as a kit on its CGX-L equatorial mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the EdgeHD 14\" for high-magnification views of planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The included 23mm eyepiece gives 170x, the highest useful magnification is 840x, and a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e adds power for high-resolution planetary and lunar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the best way to cool down the EdgeHD 14\" before observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCooling vents on the rear cell let warm air out from behind the primary mirror, and their 50-mesh filters keep dust out. Setting the telescope outside ahead of time gives it time to reach the outside temperature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for the EdgeHD 14\" and why is it important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EdgeHD 1400 forms its best images \u003cstrong\u003e146.05mm (5.75\")\u003c\/strong\u003e behind the 3.290\"x16 tpi rear thread, within about ±0.5mm. The 0.7x reducer (#94240) uses the same distance, so the same camera adapter works with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" eyepieces with the EdgeHD 14\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The EdgeHD 14\" comes with a 2\" star diagonal that includes a 1.25\" adapter. This allows you to use both 2\" and 1.25\" eyepieces and accessories, giving you maximum flexibility for visual observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eEdgeHD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e356mm (14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3910mm (154\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e840x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e51x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e15.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.39 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.33 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power (vs. Human Eye)\u003c\/td\u003e\n\u003ctd\u003e2579x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e114mm (4.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e32%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e10%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e23mm (170x Magnification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" with 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e787mm (31\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e400.5mm (15.77\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e46 lbs (21 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired back focus (native, with built-in corrector)\u003c\/td\u003e\n\u003ctd\u003e146.05mm (5.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003e3.29\"-16tpi Male (EdgeHD large thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching flattener \/ reducer\u003c\/td\u003e\n\u003ctd\u003eEdgeHD 0.7x Reducer Lens (#94240)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eMoving primary mirror with mirror clutches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEdgeHD 14\" Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope and Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal w\/ 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e23mm Eyepiece (2\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront and Rear Dust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_EdgeHD_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-EdgeHD-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16\n 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967163789597,"sku":"CEL-91060-XLT","price":10702.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-EdgeHD-14-inch-Optical-Tube-Assembly-CGE-Dovetail-91060-XLT-1__19760.1594230383.1280.1280.jpg?v=1684337857"},{"product_id":"celestron-edgehd-8-ota-cge-dovetail","title":"Celestron EdgeHD 8\" OTA - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e203.2mm (8\") EdgeHD Aplanatic Optics\u003c\/li\u003e\n\u003cli\u003e2032mm Focal Length (f\/10)\u003c\/li\u003e\n\u003cli\u003e42mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003eFastar Compatible for f\/2 Imaging\u003c\/li\u003e\n\u003cli\u003eWeighs 14 lbs (6.35 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron EdgeHD 8\" OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron EdgeHD 8\" OTA combines a 203.2mm (8\") aperture with a 2032mm focal length in an aplanatic, flat-field optical system designed for modern astroimaging. This optical tube's f\/10 focal ratio gives a Dawes resolution of 0.57 arc seconds, 843x the light gathering power of the human eye and a limiting stellar magnitude of 14. The EdgeHD 8\" delivers aberration-free stars across its 42mm image circle, weighs only 14 lbs, and is Fastar-compatible for conversion to an ultra-fast f\/2 system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEdgeHD Optics: A 42mm Flat-Field Astrograph\u003c\/h3\u003e\n\u003cp\u003eThe core of the EdgeHD 8\" is its aplanatic, flat-field \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e optical system, which produces pinpoint stars across a 42mm image circle. Unlike standard SCTs that project sharp stars onto a curved focal plane, the EdgeHD design delivers a focal plane more than three times flatter, so stars stay sharp to the edge of a flat camera sensor. Celestron optimized the 8\" for the central 28mm of its 42mm circle, the size of an APS-C chip.\u003c\/p\u003e\n\u003cp\u003eSuperior edge performance not only creates rounder stars but improves resolution and limiting magnitude compared with telescopes of equal aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging at f\/10, with a 0.7x Reducer, and at f\/2\u003c\/h3\u003e\n\u003cp\u003eEdgeHD is a flexible imaging platform.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative f\/10:\u003c\/strong\u003e At its native 2032mm focal length, the OTA gives the image scale to capture the smallest deep-sky objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced f\/7:\u003c\/strong\u003e With the optional EdgeHD 800 0.7x \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFocal Reducer\u003c\/a\u003e (#94242), you can increase your field of view without sacrificing optical performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Fast f\/2:\u003c\/strong\u003e All EdgeHD tubes are Fastar-compatible. The secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMirror Clutches and Vents in a 14 lb Tube\u003c\/h3\u003e\n\u003cp\u003eTo support the demands of long-exposure astrophotography, Celestron redesigned the EdgeHD tube. Flexible tension clutches hold the primary mirror in place after focusing, significantly reducing the potential for image shift that can compromise an exposure. Flexible rods hold the mirror without putting force or pressure on the mirror assembly.\u003c\/p\u003e\n\u003cp\u003eCooling vents on the rear cell let hot air out from behind the primary mirror, and each has an integrated 50-mesh filter that keeps dust out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e843x Light Gathering and 0.57\" Resolution\u003c\/h3\u003e\n\u003cp\u003eWith a light gathering power 843 times that of the human eye, the EdgeHD 8\" reaches a limiting stellar magnitude of 14, and StarBright XLT coatings on every surface give maximum light throughput across the visual and photographic spectrum.\u003c\/p\u003e\n\u003cp\u003eRayleigh resolution is 0.69 arc seconds and Dawes resolution 0.57 arc seconds. Every EdgeHD passes a final acceptance test with a camera and an artificial star before it ships.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use: 51x Magnification with the Included 40mm Eyepiece\u003c\/h3\u003e\n\u003cp\u003eWhile designed as an \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e, the EdgeHD 8\" is also a superb visual instrument. The package includes a 1.25\" star diagonal, a 9x50 finderscope, and a 40mm eyepiece that gives 51x.\u003c\/p\u003e\n\u003cp\u003eThe telescope's highest useful magnification is 480x, and the lowest useful magnification is 29x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Celestron EdgeHD 8\" over a standard 8\" SCT for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003eflat-field, coma-free optical design\u003c\/strong\u003e. A standard SCT has a curved focal plane, which causes stars at the edges of an imaging sensor to appear out of focus. The EdgeHD 8\" corrects for this, producing pinpoint stars across its entire 42mm image circle,\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron EdgeHD 8\" for high-resolution planetary imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. A \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e such as Celestron's 2x or 3x X-Cel LX lets imagers reach f\/22 to f\/32 for ultra-high-resolution lunar and planetary imaging, and every EdgeHD should show subtle shadings in Jupiter's belts and the Cassini Division in Saturn's rings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I convert the EdgeHD 8\" to an f\/2 imaging system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll EdgeHD tubes are \u003cstrong\u003eFastar compatible\u003c\/strong\u003e: the secondary mirror can be removed and replaced with a third-party lens accessory, sold separately, for ultra-fast f\/2 wide-field imaging with a camera at the front of the tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat camera sensor size is the EdgeHD 8\" optimized for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 8\" covers a \u003cstrong\u003e42mm image circle\u003c\/strong\u003e, and Celestron optimized it for the central 28mm, the size of an APS-C chip. With an APS-C camera, relative illumination falls to 84% at the extreme corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 14 lb weight of the EdgeHD 8\" manageable for a portable mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs \u003cstrong\u003e14 lbs (6.35 kg)\u003c\/strong\u003e and is 432mm (17\") long. Celestron sells EdgeHD 8\" kits on its CGEM II, CGX and Evolution mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the mirror clutches on the EdgeHD 8\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey hold the primary mirror in place and reduce image shift during long exposures. Focus first, then turn the two mirror lock knobs clockwise until tight; loosen them before you turn the focus knob again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount do I need for the Celestron EdgeHD 8\" OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 14 lbs and comes on a CGE dovetail bar, which fits CGE saddles such as the dual saddles on Celestron's CGEM II and CGX mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for the EdgeHD 8\" when imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EdgeHD 800 forms its best images \u003cstrong\u003e133.35mm (5.25\")\u003c\/strong\u003e behind its standard 2\"-24 tpi rear thread, within about ±0.5mm. Celestron's \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-adapter\u003c\/a\u003e for the 8\" places a camera at that distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eEdgeHD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e203.2mm (8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2032mm (80\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e40mm (51x Magnification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e480x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e29x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.69 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.57 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e843x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e64mm (2.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e31%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e9.77%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e432mm (17\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e238mm (9.37\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e14 lbs (6.35 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired back focus (native, with built-in corrector)\u003c\/td\u003e\n\u003ctd\u003e133.35mm (5.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eSCT 2\"-24tpi Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eMoving primary mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching flattener \/ reducer\u003c\/td\u003e\n\u003ctd\u003eEdgeHD 800 0.7x Focal Reducer (#94242)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEdgeHD 8\" Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e40mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCGE Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFront and Rear Dust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_EdgeHD_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-1\n6 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload EdgeHD Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-EdgeHD-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload EdgeHD Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967163822365,"sku":"CEL-91030-XLT","price":2362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-EdgeHD-8-inch-Optical-Tube-Assembly-CGE-Dovetail-91030-XLT-1__74732.1594230384.1280.1280.jpg?v=1684337859"},{"product_id":"celestron-edgehd-9-25-ota-cge-dovetail","title":"Celestron EdgeHD 9.25\" OTA  - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e234.95mm (9.25\") EdgeHD Aplanatic Optics\u003c\/li\u003e\n\u003cli\u003e2350mm Focal Length, f\/10 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAstrograph-Quality 42mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eStarBright XLT Optical Coatings\u003c\/li\u003e\n\u003cli\u003eMirror Support Clutches and Integrated Cooling Vents\u003c\/li\u003e\n\u003cli\u003eFastar Compatible for f\/2 Imaging Capability\u003c\/li\u003e\n\u003cli\u003eOptical Tube Weight: 21 lbs (9.53 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron EdgeHD 9.25\" OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron EdgeHD 9.25\" OTA delivers true \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e performance with its 234.95mm (9.25\") aperture and 2350mm focal length, producing a flat 42mm image circle. Its aplanatic optical system achieves a Dawes resolution of 0.49 arc seconds, with 1127x the light-gathering power of the human eye and a limiting stellar magnitude of 14.4. The aluminum optical tube weighs 21 lbs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEdgeHD Optics: A 42mm Flat-Field Aplanatic System\u003c\/h3\u003e\n\u003cp\u003eThe core of the EdgeHD 9.25\" is its specialized optical design, which corrects for both off-axis coma and field curvature across a wide field of view. Its focal plane is more than three times flatter than a standard \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e, an astrograph-quality flat field all the way to the edge of the 42mm field.\u003c\/p\u003e\n\u003cp\u003eStarBright XLT coatings on every surface give maximum light throughput, and every EdgeHD passes a final acceptance test with a camera and an artificial star before it ships.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e9.25\" Aperture at f\/10: Resolving 0.49 Arc Seconds\u003c\/h3\u003e\n\u003cp\u003eWith a 234.95mm (9.25\") primary mirror, this telescope gathers 1127 times more light than the human eye, and the limiting stellar magnitude is 14.4. Dawes resolution is 0.49 arc seconds and the highest useful magnification is 555x.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral Obstruction:\u003c\/strong\u003e The 85mm secondary mirror creates a central obstruction of 36% by diameter and 13% by area.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Eyepiece:\u003c\/strong\u003e The supplied 23mm eyepiece gives 102x.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging at f\/10 and f\/2: 146.05mm Back Focus and Fastar\u003c\/h3\u003e\n\u003cp\u003eAt its native f\/10, you get the image scale to capture the smallest deep-sky objects. The EdgeHD 925 forms its best images 146.05mm (5.75\") behind the heavy-duty 3.290\"x16 tpi rear thread, a generous back focus.\u003c\/p\u003e\n\u003cp\u003eFor wide-field targets, the OTA is Fastar-compatible. The secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f\/2 wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for Imaging: Mirror Clutches and Filtered Cooling Vents\u003c\/h3\u003e\n\u003cp\u003eCelestron redesigned the mechanical systems of the EdgeHD tube to support long-exposure astrophotography. Flexible tension clutches hold the primary mirror in place after focusing, significantly reducing the image shift that can occur as the telescope tracks across the sky. Flexible rods hold the mirror without putting force on the mirror assembly, keeping the image centered in the eyepiece or on the sensor.\u003c\/p\u003e\n\u003cp\u003eTo ensure optimal image quality, cooling vents on the rear cell allow hot air to escape from behind the primary mirror. Each vent has an integrated 50-mesh filter that lets warm air out without letting dust in.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 21 lb OTA with CGE Dovetail and 9x50 Finderscope\u003c\/h3\u003e\n\u003cp\u003eThe aluminum optical tube assembly weighs 21 lbs (9.53 kg) and has a length of 559mm (22\"), and comes on a CGE \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Finderscope:\u003c\/strong\u003e A 9x50 optical finderscope helps you manually locate and center targets before observing or imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Diagonal:\u003c\/strong\u003e A 2\" star diagonal with a 1.25\" adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusing System:\u003c\/strong\u003e Focus moves the primary mirror; lock the mirror clutches once focused and loosen them before refocusing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Celestron EdgeHD 9.25\" over a standard SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEdgeHD is aplanatic and flat field: Celestron designed it to reduce more than off-axis coma, with a focal plane more than three times flatter than a standard Schmidt-Cassegrain, so stars stay sharp to the edge of a flat camera sensor across a 42mm field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Celestron EdgeHD 9.25\" perform on Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEvery EdgeHD should resolve double stars to the Dawes limit (0.49 arc seconds here), show subtle shadings in Jupiter's belts and reveal the Cassini Division in Saturn's rings on a night of good seeing. A \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e lets imagers reach f\/22 to f\/32 for high-resolution lunar and planetary work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for imaging with the 21 lb Celestron EdgeHD 9.25\" OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs \u003cstrong\u003e21 lbs\u003c\/strong\u003e and comes on a CGE dovetail bar. Celestron sells EdgeHD 9.25 kits on its Advanced VX, CGEM II, CGX and CGX-L mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Fastar-compatible\" mean for the EdgeHD 9.25\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe secondary mirror can be removed and replaced with a third-party lens accessory, sold separately, turning the f\/10 telescope into an \u003cstrong\u003eultra-fast f\/2 wide-field imaging system\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the mirror clutches on the EdgeHD 9.25\" improve astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFlexible tension clutches hold the primary mirror in place and reduce image shift during long exposures. Focus first, then turn the two mirror lock knobs clockwise until tight; loosen them before you turn the focus knob again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the required 146.05mm back focus on the EdgeHD 9.25\" important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe EdgeHD 925 forms its best images 146.05mm (5.75\") behind the rear cell's 3.290\"x16 tpi thread, within about ±0.5mm. Placing the sensor there is the goal for the sharpest wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill my full-frame camera work well with the Celestron EdgeHD 9.25\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEdgeHD is designed for a flat 42mm diameter field, and Celestron's final acceptance test checks every tube for sharp images at the center and at each corner of a full-frame (24x36mm, 42mm diagonal) camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eEdgeHD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e234.95mm (9.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2350mm (93\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e42mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e1127x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.59 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Stellar Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e555x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLowest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e34x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Obstruction\u003c\/td\u003e\n\u003ctd\u003e85mm (3.35\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Diameter\u003c\/td\u003e\n\u003ctd\u003e36%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObstruction by Area\u003c\/td\u003e\n\u003ctd\u003e13%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFastar Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e559mm (22\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e271.78mm (10.7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e21 lbs (9.53 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finderscope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Star Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" with 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e23mm (102x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired back focus\u003c\/td\u003e\n\u003ctd\u003e146.05mm (5.75\") from rear cell thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eEdgeHD 3.29\"-16tpi Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eMoving primary mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEdgeHD 9.25\" Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope and Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal with 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e23mm Eyepiece, 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron_EdgeHD_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-EdgeHD-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron EdgeHD Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967163855133,"sku":"CEL-91040-XLT","price":4308.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-EdgeHD-9-25-inch-Optical-Tube-Assembly-CGE-Dovetail-91040-XLT-1__48406.1594230385.1280.1280.jpg?v=1684337864"},{"product_id":"celestron-11-rasa-v2-ota-cge-dovetail","title":"Celestron 11\" RASA V2 OTA - CGE Dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e279mm (11\") Rowe-Ackermann Schmidt Astrograph\u003c\/li\u003e\n\u003cli\u003eExtremely Fast f\/2.2 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e620mm Focal Length for Wide-Field Imaging\u003c\/li\u003e\n\u003cli\u003e43.3mm Optimized Image Circle for Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003e43 lbs (19.5 kg) Optical Tube Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron 11\" RASA V2 OTA - CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Celestron 11\" Rowe-Ackermann Schmidt Astrograph (RASA 11) V2 combines a massive 279mm (11\") aperture with an incredibly fast f\/2.2 optical system that allows shorter exposure times than traditional f\/10 astroimaging, without sacrificing resolution. Its 620mm focal length delivers a vast field of view across a 43.3mm optimized image circle, with spot sizes under 4.4 μm RMS across the field. With 1588x the light-gathering power of the human eye, the RASA 11 V2 allows shorter sub-exposures, so your \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mount\u003c\/a\u003e does not need to track accurately over extended periods; in many cases, autoguiding will not be required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe f\/2.2 Rowe-Ackermann Schmidt Design: Capturing Data Faster\u003c\/h3\u003e\n\u003cp\u003eThe core of the RASA 11 V2 is its f\/2.2 focal ratio. It allows shorter exposure times than traditional f\/10 astroimaging without sacrificing resolution, and the short 620mm focal length also lessens equatorial tracking demands. The design builds on Celestron's Schmidt Cameras, which let astrophotographers make much shorter exposures on film in the 1970s.\u003c\/p\u003e\n\u003cp\u003eThis design places a 4-element rare-earth glass lens group at the front of the telescope, where the camera mounts. Engineered for a wide 400-700 nm wavelength range and finished with StarBright XLT coatings, the optical system delivers images free of false color, coma, and field curvature. Celestron adds that the design provides minimal vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e11\" Aperture and 620mm Focal Length: A 43.3mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eDesigned for modern \u003ca href=\"\/collections\/cameras\"\u003eastronomy cameras\u003c\/a\u003e, the RASA 11 V2 produces a 43.3mm optimized image circle, to capture pinpoint stars on large imaging chips, and optical performance is still excellent for sensors with \u003ca href=\"\/collections\/diagonals\"\u003ediagonals\u003c\/a\u003e up to 52mm. Combined with the 620mm focal length, it is suitable for wide-field imaging, huge mosaics of the night sky, surveying and even comet hunting.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRMS Spot Size:\u003c\/strong\u003e At less than 4.4 μm across the field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-Axis Illumination:\u003c\/strong\u003e The field remains evenly illuminated, maintaining 83% brightness at 21mm off-axis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral Obstruction:\u003c\/strong\u003e The 114mm central obstruction, at 41% of the aperture diameter,.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCamera Integration: 55mm Back Focus with M42 \u0026amp; M48 Adapters\u003c\/h3\u003e\n\u003cp\u003eThe two included camera adapters allow 55mm of distance from the adapter to the imaging sensor. The M42 adapter fits most cameras with standard T-threads, and the wider M48 adapter can be used with full-frame cameras with minimal vignetting. DSLRs need a \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e for the camera make (sold separately). If your astronomical camera has less than 55mm of back focus, add a spacer to reach the correct distance; cameras with sensors larger than 43mm diagonal need a custom adapter, and Celestron's website has a drawing of the camera adapter requirements.\u003c\/p\u003e\n\u003cp\u003eThe camera attaches to the front of the astrograph via a knurled retaining ring that secures the adapter to the main lens group housing. This system allows for easy rotation of the camera to frame your target perfectly without removing it from the optical tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFilter Integration: Removing the Optical Window for Peak Performance\u003c\/h3\u003e\n\u003cp\u003eTo maintain the highest optical performance, the RASA 11 V2 is designed to have its integrated optical window removed when a filter is placed in the light path. Because the f\/2.2 system is so fast, any additional flat glass (like a filter or a camera's own sensor window) can affect image quality. Remove the window whenever a filter is used, and consider it if your camera has its own optical window.\u003c\/p\u003e\n\u003cp\u003eThis feature allows you to use your preferred imaging filters without compromising the optical correction. Celestron also offers a Light Pollution Imaging Filter designed specifically for the RASA 11 that mounts in place of the optical window, which can help with longer sub-exposures from light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Ultra-Stable Focus System (USFS): Minimizing Image Shift\u003c\/h3\u003e\n\u003cp\u003eA common challenge in moving-mirror telescopes is focus shift and mirror flop. The RASA 11 V2 addresses this with the Ultra-Stable Focus System (USFS), a redesigned \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e built around a precision linear ball bearing. The bearing minimizes focus shift (unwanted lateral motion of the primary mirror during focusing, which shifts the image) and mirror flop (movement of the primary mirror as the telescope points to different positions in the sky).\u003c\/p\u003e\n\u003cp\u003eThe USFS is compatible with the optional Celestron Focus Motor (#94155-A), which lets you focus from the same computer that controls the camera; the manual notes that third-party software can even autofocus with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThermal Management: The 12V DC MagLev Cooling Fan\u003c\/h3\u003e\n\u003cp\u003eReaching thermal equilibrium is essential for sharp images, and the RASA 11 V2 accelerates this process with an integrated cooling system. A 12V DC MagLev fan, located in the rear cell, pulls ambient air through the optical tube and past the primary mirror. This active ventilation significantly reduces cooldown time, allowing you to start imaging sooner.\u003c\/p\u003e\n\u003cp\u003eThe fan is powered by an included battery pack that holds 8 AA batteries (not included) or any external 12V DC \u003ca href=\"\/collections\/power-accessories\"\u003epower supply\u003c\/a\u003e providing at least 100mA. The vents are filtered to prevent dust from entering the optical tube, ensuring the internal optics remain clean while the system stabilizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecise Alignment: Collimation and Camera Rotation\u003c\/h3\u003e\n\u003cp\u003eWhile the RASA 11 V2 arrives factory-aligned, minor adjustments may be needed after transport. Collimation is performed by adjusting the tilt of the front lens assembly using a simple push-pull system of three screw pairs. This process is done with the camera installed: defocus a star by about one turn of the focus knob and adjust one pair of screws (3mm socket head and 2mm set screw) at a time until the pattern is concentric.\u003c\/p\u003e\n\u003cp\u003eCamera orientation is equally straightforward. By slightly loosening the main retaining ring (no more than 1\/8th of a turn), you can rotate the camera to achieve the ideal framing for your target. Once positioned, you simply retighten the ring to secure the camera in place.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the 43 lb RASA 11 V2: CGE Dovetail System\u003c\/h3\u003e\n\u003cp\u003eThe RASA 11 V2 optical tube weighs 43 lbs (19.5 kg) and measures 33\" long. It comes equipped with a CGE-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e, which is compatible with mounts that accept CGE or Losmandy-D plates. A mount with a load capacity greater than the astrograph's weight is required for good performance once a camera and accessories are added.\u003c\/p\u003e\n\u003cp\u003eIn addition to the primary mounting bar, a second CGE-style dovetail is included on the top of the optical tube. It provides a connection for optional accessories like a \u003ca href=\"\/collections\/autoguiding\"\u003eguidescope\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Celestron RASA 11 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOur specification table gives the optical tube weight as \u003cstrong\u003e43 lbs (19.5 kg)\u003c\/strong\u003e. A mount with a load capacity greater than the astrograph's weight is required to ensure good performance once a camera and accessories are added. The CGE dovetail bar fits mounts that accept a CGE or Losmandy-D style dovetail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach my camera to the RASA 11 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RASA 11 V2 includes both a \u003cstrong\u003e42mm T-thread adapter\u003c\/strong\u003e and a \u003cstrong\u003e48mm adapter\u003c\/strong\u003e. These adapters are designed to place your camera's sensor at the required \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance. The M42 adapter fits most cameras with standard T-threads, and the M48 adapter suits full-frame cameras. Place the retaining ring over the adapter, thread it loosely onto the lens group housing, thread the camera (or T-ring) onto the adapter, then finish tightening the ring until the adapter is snug, without overtightening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the RASA 11 V2 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Rowe-Ackermann Schmidt Astrograph is a dedicated photographic instrument. Its prime-focus design, where the camera is mounted at the front of the tube, does not accommodate an \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e or diagonal for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the Ultra-Stable Focus System (USFS) on the RASA 11?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe USFS is built around a precision linear ball bearing. It minimizes focus shift (unwanted lateral motion of the primary mirror while focusing, which shifts the image) and mirror flop (movement of the primary mirror as the telescope points to different positions in the sky).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use filters with the RASA 11 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor best optical performance, when you add a filter into the light path, you should remove the RASA's integrated optical window. This is done by carefully unthreading the knurled cell holding the window at the front of the lens group. This step compensates for the filter's glass, maintaining the system's precise optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the RASA 11 V2 suitable for high-magnification planetary imaging of Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the RASA 11 is not designed for this purpose. Its short \u003cstrong\u003e620mm focal length\u003c\/strong\u003e results in a very small image scale, which cannot resolve fine details on planets. It is designed for wide-field imaging, mosaics, surveying and comet hunting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the cooling fan on the RASA 11 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe integrated 12V DC MagLev fan is for thermal management. It pulls ambient air through the optical tube to help the large \u003cstrong\u003e11\" primary mirror\u003c\/strong\u003e reach the outside temperature more quickly. Turn the fan on before using the RASA, while you prepare your other equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to collimate the RASA 11 V2 often?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RASA is factory aligned but may need a slight adjustment after it is transported. The primary mirror and corrector are permanently aligned at the factory; you adjust only the tilt of the lens assembly, with the camera installed, using the three pairs of push-pull collimation screws.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e279mm (11\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e620mm (24.4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e43.3mm (1.7\") Ø\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable Field\u003c\/td\u003e\n\u003ctd\u003e52mm (2.04\") Ø\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power\u003c\/td\u003e\n\u003ctd\u003e1588x (Compared to human eye)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.41 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.49 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot Size\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 4.4 μm RMS across FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral Obstruction Diameter\u003c\/td\u003e\n\u003ctd\u003e114mm (4.48\") (41% of aperture)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e400 - 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination\u003c\/td\u003e\n\u003ctd\u003e83% at 21mm off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (with adapter)\u003c\/td\u003e\n\u003ctd\u003e55mm (2.16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (from collar)\u003c\/td\u003e\n\u003ctd\u003e72.8mm (2.86\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eUltra-Stable Focus System (USFS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e838.2mm (33\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e330.2mm (13\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e43 lbs (19.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eCGE Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFeatures\u003c\/td\u003e\n\u003ctd\u003eVentilation fan, dual dovetail mounting bars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Male (T-adapter) \/ M48x0.75 Male (wide adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003e4-element rare-earth glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e11\" Rowe-Ackermann Schmidt Astrograph V2 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e42mm T-thread camera adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e48mm camera adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFan battery pack\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-RASA-Optics-Whitepaper.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload RASA Optics Whitepaper\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Celestron Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron Warranty Policy\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967184695581,"sku":"CEL-91076","price":6254.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-11-inch-Rowe-Ackermann-Schmidt-Astrograph-RASA-11-V2-Optical-Tube-Assembly-CGE-Dovetail-91076-1__46768.1594230530.1280.1280.jpg?v=1684338358"},{"product_id":"sky-watcher-quattro-200p-imaging-newtonian-8-205-mm","title":"Sky-Watcher Quattro 200P Imaging Newtonian 8\" (203 mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e203mm (8\") Primary Aperture\u003c\/li\u003e\n\u003cli\u003e800mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/4 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e2-inch Dual-Speed 10:1 Linear Power Focuser\u003c\/li\u003e\n\u003cli\u003e9.5 kg (20.9 lb) OTA Weight\u003c\/li\u003e\n\u003cli\u003eNine Internal Knife-Edge Baffle Rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Quattro 200P Imaging Newtonian 8\" (203 mm)\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Quattro 200P is an 8\" (203mm) Newtonian \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e with an 800mm focal length at f\/4. Sky-Watcher designs it for wide-field, deep-space imaging, with a parabolic primary mirror, a tube lined with nine knife-edge baffles, a 70mm secondary mirror and a 2-inch dual-speed 10:1 linear power \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFast f\/4 Optics With a Parabolic Mirror\u003c\/h3\u003e\n\u003cp\u003eThe f\/4 focal ratio is very fast and lets faint galaxies and nebulae show detail with limited exposure time. The primary mirror is parabolic and the secondary is flat, both of low-expansion borosilicate glass, which gives near-zero thermal expansion and shorter cool-down times.\u003c\/p\u003e\n\u003cp\u003eThe Quattro also gives nice visual images even without a \u003ca href=\"\/collections\/coma-correctors\"\u003ecoma corrector\u003c\/a\u003e. No eyepiece is supplied: many astrophotographers already have eyepieces, so Sky-Watcher chose not to charge for one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Offset Secondary Mirror\u003c\/h3\u003e\n\u003cp\u003eThe 70mm secondary mirror is mounted full offset, so the spider vanes look off-center when you look in through the focuser; this is normal. The fully illuminated field is 44 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eComa Corrector and Back Focus\u003c\/h3\u003e\n\u003cp\u003eA high-quality coma corrector is an essential accessory for wide-field astrophotography, and it is left out of the box so you can choose the best fit. Sky-Watcher's F4 Coma Corrector (4 lenses, enlarged T2 thread) is one option.\u003c\/p\u003e\n\u003cp\u003eThe standard back focus is 55mm, and the drawtube extends up to 75mm from its base. The 75mm of travel is not 75mm of free back focus, so test your camera, \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e and guider combination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2-inch Dual-Speed 10:1 Linear Power Focuser\u003c\/h3\u003e\n\u003cp\u003eFour precision ball bearings support the drawtube, giving stability and zero image shift with a heavy eyepiece or camera. A roller moves the drawtube instead of a rack and pinion.\u003c\/p\u003e\n\u003cp\u003eFocus with the main knobs until the image is nearly sharp, then with the 1:10 knob until it is sharp. The focuser also has:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTension adjustment:\u003c\/strong\u003e a large thumbscrew below the focuser; correct tension lets you focus smoothly without the imaging train moving under gravity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus lock:\u003c\/strong\u003e a thumbscrew on top locks the drawtube; loosen it to focus and tighten it when a heavy load is attached.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT2 plate:\u003c\/strong\u003e the 1.25-inch adapter is a tube screwed onto a T2 (42x0.75mm) plate; unscrew the tube to use the plate with your T2 accessory adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eKnife-Edge Baffles and Thin Secondary Vanes\u003c\/h3\u003e\n\u003cp\u003eThe tube is lined with nine internal knife-edge baffle rings: they cut down stray light entering the tube and help improve image contrast. The tube weighs 9.5 kg (20.9 lb) and is 71.1 cm long and 23.5 cm in diameter.\u003c\/p\u003e\n\u003cp\u003eThe secondary sits on 0.5 mm ultra-thin vanes, which limit heat build-up and reach thermal equilibrium quickly. A pair of tube rings and a V-style dovetail plate are included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCollimation and Focuser Parallelism\u003c\/h3\u003e\n\u003cp\u003eThe mirrors are aligned at the factory; check the alignment on a bright star, which should look symmetrical.\u003c\/p\u003e\n\u003cp\u003eIf it does not, loosen the primary's blocking screws, make small corrections with the large adjustment knobs, and lock them again. For heavy misalignment the secondary should be aligned too, and an optional \u003ca href=\"\/collections\/collimation-tools\"\u003elaser collimator\u003c\/a\u003e is recommended. If stars in the four corners of a wide-field image look different, the focuser may need realigning with its push-pull screws; this is a delicate operation, so check for other causes first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBalancing a Heavy Imaging Train\u003c\/h3\u003e\n\u003cp\u003eThe tube weighs 9.5 kg (20.9 lb) and comes with tube rings and a V-style dovetail plate, so choose a mount with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e and a payload rating that covers the tube plus your camera and accessories.\u003c\/p\u003e\n\u003cp\u003eA heavy imaging train on the side-mounted focuser unbalances the tube. Sky-Watcher's solution is to rotate the tube so the imaging train points vertically to the ground; it warns that gravity is then your enemy, so secure every accessory to the focuser and set the focuser tension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCool-Down and Refocusing\u003c\/h3\u003e\n\u003cp\u003eThe low-expansion borosilicate mirrors give shorter cool-down times, and the manual notes the image usually needs fine refocusing over time as the temperature changes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFinder Alignment\u003c\/h3\u003e\n\u003cp\u003eTo focus the finderscope, look at an object at least 500 meters away, loosen the knurled ring, turn the front lens holder until sharp and lock it with the ring. Then center that object in the main telescope's eyepiece.\u003c\/p\u003e\n\u003cp\u003eUse the finder bracket's adjustment screws to center the crosshairs on the same object. The image in the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e is upside-down, which is normal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSolar safety:\u003c\/strong\u003e Never look directly at the Sun with the telescope or the finderscope, and never use an eyepiece-type \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount does the Sky-Watcher Quattro 200P require for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 9.5 kg (20.9 lb) and comes with tube rings and a V-style dovetail plate, so choose a mount with a Vixen-style saddle and a payload rating that covers the tube plus your camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a coma corrector necessary for the Quattro 200P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA high-quality coma corrector is an essential accessory for wide-field astrophotography; the Quattro also gives nice visual images without one. None is included. Sky-Watcher's own F4 Coma Corrector (4 lenses, enlarged T2 thread) is the matching option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much back focus is there?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard back focus is 55mm, and the drawtube extends up to 75mm from its base. The 75mm of travel is not 75mm of free back focus, so test your setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use it visually?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Quattro gives nice visual images even without a coma corrector. No eyepiece is supplied; insert yours in the included 2-inch or 1.25-inch adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I check collimation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLook at a bright star: it should be a symmetrical dot with centered diffraction rings. If not, loosen the primary's blocking screws, make small corrections with the adjustment knobs, and lock them again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do the spider vanes look off-center when I look into the focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 70mm secondary mirror is mounted full offset, so the vanes look off-center through the focuser. This is normal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach my DSLR or a camera with T2 threads to the Quattro 200P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 1.25-inch adapter is a tube screwed onto a T2 (42x0.75mm) plate. Unscrew the tube and attach your T2 accessory adapter to the plate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I balance the Quattro 200P on my mount with a heavy camera attached?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRotate the tube so the imaging train points vertically to the ground. Secure every accessory to the focuser, set the tension with the large thumbscrew below it, and lock the drawtube with the top thumbscrew once in focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is no eyepiece included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany astrophotographers already have eyepieces, so Sky-Watcher chose not to charge for one. The coma corrector is also left out so you can choose the best fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the mirrors of the Quattro 200P made from?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA parabolic primary and a flat secondary, both of low-expansion borosilicate glass, which gives near-zero thermal expansion and shorter cool-down times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat should I do if stars look sharp in one corner of my image but not the others?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf the stars in the four corners look different, the focuser may need realigning with its push-pull screws. This is a delicate operation, so check for other causes first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e203mm (8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e800mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2-inch dual-speed 10:1 linear power focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e71.1 cm, tube diameter 23.5 cm (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e9.5 kg (20.9 lb) tube (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder Scope\u003c\/td\u003e\n\u003ctd\u003e9x50 Straight-Through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eTube Rings \u0026amp; V-style Dovetail Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112109\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eQuattro 200P Newtonian OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Eyepiece Adapter (T2 Threaded)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher_Quattro_200P_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Quattro Imaging Newtonian Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher_Newtonian_Dobsonian_Collimation_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Collimation Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190135069,"sku":"SW-S11210","price":1290.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Quattro-200P-Imaging-Newtonian-8inch-205-mm-S11210-1__46916.1594170760.1280.1280.jpg?v=1684338343"},{"product_id":"sky-watcher-quattro-250p-imaging-newtonian-10-254-mm","title":"Sky-Watcher Quattro 250P Imaging Newtonian 10\" (254 mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e254mm (10\") Newtonian Reflector Astrograph\u003c\/li\u003e\n\u003cli\u003e1000mm Focal Length\u003c\/li\u003e\n\u003cli\u003eFast f\/4 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e2-inch Dual-Speed 10:1 Linear Power Focuser\u003c\/li\u003e\n\u003cli\u003eLow-Expansion Borosilicate Primary Mirror\u003c\/li\u003e\n\u003cli\u003eFinderscope, Tube Rings and V-Style Dovetail Plate Included\u003c\/li\u003e\n\u003cli\u003eWeighs 15.1 kg (33.3 lb)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Quattro 250P Imaging Newtonian 10\" (254 mm)\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Quattro 250P is a 10\" (254mm) imaging Newtonian with a 1000mm focal length at f\/4, a paraboloidal primary mirror, knife-edge ray-traced baffles and a 2-inch dual-speed 10:1 linear power \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e. The 15.1 kg (33.3 lb) tube comes with tube rings, a V-style dovetail plate and a finderscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAn f\/4 Imaging Newtonian\u003c\/h3\u003e\n\u003cp\u003eSky-Watcher presents the fast f\/4 focal ratio as especially important for astrophotographers working with long exposures. It notes that imaging telescopes made of less thermally stable material can drift from best focus during long exposures, and says the Quattro stays in focus for longer.\u003c\/p\u003e\n\u003cp\u003eThe tube interior has knife-edge, ray-traced baffles. The highest practical power is 508x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParaboloidal Mirror and Thin Secondary Supports\u003c\/h3\u003e\n\u003cp\u003eThe paraboloidal primary mirror is made of low-expansion borosilicate glass, which gives substantially shorter cool-down times.\u003c\/p\u003e\n\u003cp\u003eThe secondary mirror is 89mm, on 0.5 mm ultra-thin secondary mirror supports.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eComa Corrector and What Is Not Included\u003c\/h3\u003e\n\u003cp\u003eNo \u003ca href=\"\/collections\/coma-correctors\"\u003ecoma corrector\u003c\/a\u003e and no eyepiece are included. For the Quattro series, a high-quality coma corrector is an essential accessory for wide-field astrophotography, and the telescopes also give nice visual images without one.\u003c\/p\u003e\n\u003cp\u003eA 2\" to 1.25\" eyepiece adapter is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2-Inch Dual-Speed 10:1 Linear Power Focuser\u003c\/h3\u003e\n\u003cp\u003eFour precision ball bearings support the drawtube, giving stability and zero image shift with a heavy eyepiece or camera.\u003c\/p\u003e\n\u003cp\u003eA roller moves the drawtube instead of a rack and pinion, and a second knob with a 10:1 reduction gives super-fine adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e15.1 kg Tube, Rings and Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe tube weighs 15.1 kg (33.3 lb) and measures 25.75 cm by 73 cm (skywatcher.com). It is supplied with a pair of tube rings and a V-style dovetail plate.\u003c\/p\u003e\n\u003cp\u003eThe AZ-EQ6 Pro and EQ6 Pro are related mounts. Choose a mount with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e and a payload rating that covers the tube plus your camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSolar Safety\u003c\/h3\u003e\n\u003cp\u003eNever point the telescope or its finder at the Sun without a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e securely covering the front of the telescope: looking at the Sun through it will cause permanent eye damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Sky-Watcher Quattro 250P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 15.1 kg (33.3 lb) and comes with tube rings and a V-style dovetail plate, so choose a mount with a Vixen-style saddle and a payload rating that covers the tube plus your camera and accessories. The AZ-EQ6 Pro and EQ6 Pro are related mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a coma corrector essential for the Quattro 250P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor the Quattro series, a high-quality coma corrector is an essential accessory for wide-field astrophotography. None is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use it visually?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Quattro series also gives nice visual images without a coma corrector, and the highest practical power is 508x. No eyepiece is included; a 2\" to 1.25\" adapter is.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the focal ratio matter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher presents the fast f\/4 focal ratio as especially important for astrophotographers working with long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the borosilicate mirror in the Quattro 250P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe low-expansion borosilicate primary mirror gives substantially shorter cool-down times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the focuser on the Quattro 250P handle heavy cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe four precision ball bearings supporting the drawtube give stability and zero image shift while supporting a heavy eyepiece or camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the tube interior have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eKnife-edge, ray-traced baffles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre eyepieces included with the Quattro 250P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. A 2\" to 1.25\" eyepiece adapter is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the dimensions and weight of the Quattro 250P tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eskywatcher.com lists the tube at 15.1 kg (33.3 lb), 25.75 cm by 73 cm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size is the secondary mirror?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e89mm, on 0.5 mm ultra-thin supports.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the Quattro 250P to my mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt comes with a pair of tube rings on a V-style dovetail plate, which fits a Vixen-style saddle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e254mm (10\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e89mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2-inch dual-speed 10:1 linear power focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e73 cm (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e15.1 kg (33.3 lb) tube (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder Scope\u003c\/td\u003e\n\u003ctd\u003e9x50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Accessories\u003c\/td\u003e\n\u003ctd\u003eTube Rings \u0026amp; V-style Dovetail Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112208\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eQuattro 250P Newtonian OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher_Newtonian_Dobsonian_Collimation_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Newtonian Collimation Guide\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190200605,"sku":"SW-S11220","price":1840.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Quattro-250P-Imaging-Newtonian-10inch-254-mm-S11220-1__23353.1594170761.1280.1280.jpg?v=1684338355"},{"product_id":"sky-watcher-quattro-300p-imaging-newtonian-12-305-mm","title":"Sky-Watcher Quattro 300P Imaging Newtonian 12\" (305 mm)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e305mm (12\") Primary Aperture\u003c\/li\u003e\n\u003cli\u003e1200mm Focal Length\u003c\/li\u003e\n\u003cli\u003eFast f\/4 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e2\" Dual-Speed Crayford Focuser\u003c\/li\u003e\n\u003cli\u003e57 lbs Optical Tube Assembly Weight\u003c\/li\u003e\n\u003cli\u003eIncludes 9x50 Finderscope, Tube Rings, and D-Style Dovetail\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Quattro 300P Imaging Newtonian 12\" (305 mm)\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Quattro 300P is a 12\" (305mm) imaging \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonian\u003c\/a\u003e with a 1200mm focal length at f\/4 and a 2\" dual-speed Crayford \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e. The tube is 42.5\" long, 14.25\" in outer diameter and 57 lb with accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e305mm f\/4 Optics\u003c\/h3\u003e\n\u003cp\u003eThe 305mm primary mirror has a 1200mm focal length, giving f\/4. The primary edge thickness is 38mm and the secondary mirror 102mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFocuser and Accessories\u003c\/h3\u003e\n\u003cp\u003eThe 2\" dual-speed Crayford focuser has a fine-focus knob alongside the main knobs. A 2\" to 1.25\" eyepiece adapter is included for 1.25\" accessories.\u003c\/p\u003e\n\u003cp\u003eNo \u003ca href=\"\/collections\/coma-correctors\"\u003ecoma corrector\u003c\/a\u003e or eyepiece is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the 57 lb Tube\u003c\/h3\u003e\n\u003cp\u003eThe box holds the tube, a 9x50 finderscope, a pair of tube rings, a D-style dovetail rail and a 2\" to 1.25\" adapter.\u003c\/p\u003e\n\u003cp\u003eThe tube rings and D-style dovetail rail need a mount with a D-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e and a payload rating that covers the 57 lb tube plus your camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSolar Safety\u003c\/h3\u003e\n\u003cp\u003eNever point the telescope or its finder at the Sun without a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e securely covering the front of the telescope: looking at the Sun through it will cause permanent eye damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Sky-Watcher Quattro 300P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 57 lb with accessories and comes with a D-style dovetail rail. Choose a mount with a D-style saddle and a payload rating that covers the tube plus your camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a coma corrector included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The box holds the tube, a 9x50 finderscope, tube rings, a D-style dovetail rail and a 2\" to 1.25\" adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use it visually?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, with your own eyepieces: the 2\" focuser takes 2\" eyepieces and the included adapter takes 1.25\" ones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat focal length and ratio does it have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e1200mm at f\/4, with a 305mm primary mirror.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size is the secondary mirror?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e102mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my 1.25\" eyepieces with the Quattro 300P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. A 2\" to 1.25\" eyepiece adapter is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat focuser does it have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a 2\" dual-speed Crayford focuser: a main knob for coarse focus and a fine-focus knob for small adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the tube's outer diameter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 14.25\"; the included tube rings fit the tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow long and heavy is the tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is 42.5\" long and 57 lb with accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary mirror made of?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBorosilicate glass, with a 38mm edge thickness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234112307\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e305mm (12\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1200mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Reflectivity\u003c\/td\u003e\n\u003ctd\u003e94%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBorosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Edge Thickness\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Dual-Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e42.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e14.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e57 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eQuattro 300P OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eD-Style Dovetail Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher_Quattro_200P_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Sky-Watcher Quattro 300P Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190233373,"sku":"SW-S11230","price":2770.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Quattro-300P-Imaging-Newtonian-12inch-305-mm-S11230-1__45761.1594170762.1280.1280.jpg?v=1684338368"},{"product_id":"sky-watcher-skymax-102","title":"Sky-Watcher Skymax 102","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm Maksutov-Cassegrain Optical Tube\u003c\/li\u003e\n\u003cli\u003e1300mm Focal Length \u0026amp; f\/12.7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated Lens \u0026amp; 94% Reflectivity Mirror Coatings\u003c\/li\u003e\n\u003cli\u003eWeighs 4.6 lbs with a 12.25\" Tube Length\u003c\/li\u003e\n\u003cli\u003eIncludes 25mm (52x) \u0026amp; 10mm (130x) Eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Skymax 102\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Skymax 102 is a 102mm Maksutov-Cassegrain with a 1300mm focal length (f\/12.7). The tube is 12.25\" long and 4.6 lb with accessories, and it comes with Super 25mm and Super 10mm eyepieces (52x and 130x), a 1.25\" star diagonal, a red dot finder and a soft carrying case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Take-Anywhere Maksutov\u003c\/h3\u003e\n\u003cp\u003eMaksutov-Cassegrains are take-anywhere telescopes, also ideal when working space is limited, with high-resolution, diffraction-limited optical systems multi-coated to maximize contrast and image sharpness, for terrestrial and astronomical use.\u003c\/p\u003e\n\u003cp\u003eFor the 102mm \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutov\u003c\/a\u003e, the highest practical power is 204x and the faintest stellar magnitude 12.7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMulti-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eThe Skymax 102 puts its 1300mm focal length in a tube 12.25\" long and 4.625\" in diameter (Sky-Watcher USA).\u003c\/p\u003e\n\u003cp\u003eThe Maksutov optical systems are high-resolution and diffraction-limited, multi-coated to maximize contrast and image sharpness. The lenses are fully multi-coated, and the mirrors carry Sky-Watcher's Radiant Aluminum Quartz (RAQ) coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEyepieces and Magnification\u003c\/h3\u003e\n\u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's. Both included eyepieces are 1.25\", as are the star diagonal and the \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e (1.25\" focuser diameter):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper 25mm:\u003c\/strong\u003e 1300 \/ 25 = 52x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper 10mm:\u003c\/strong\u003e 1300 \/ 10 = 130x.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSky-Watcher's rule of thumb is that usable magnification is about 2x per mm of aperture under good conditions, because higher power also magnifies the air turbulence between the telescope and the subject.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFocusing\u003c\/h3\u003e\n\u003cp\u003eFocus is by moving the primary mirror (Sky-Watcher USA), with the focusing knob and a focus locking screw at the rear of the tube. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes and flexure, and almost always after changing an eyepiece or adding or removing a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting and Carrying\u003c\/h3\u003e\n\u003cp\u003eA V-style dovetail rail comes pre-installed. The Maksutov tube assemblies can also be mounted on a standard photographic \u003ca href=\"\/collections\/tripods-and-piers\"\u003etripod\u003c\/a\u003e, and the 102mm Maksutov is also sold as a kit on Sky-Watcher's AZ-Go2 Wi-Fi GoTo mount.\u003c\/p\u003e\n\u003cp\u003eIt weighs 4.6 lb with accessories and measures 12.25\" long and 4.625\" in diameter, and a soft carrying case is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSolar Safety\u003c\/h3\u003e\n\u003cp\u003eNever look directly at the Sun through the telescope: permanent eye damage will result. Use a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e firmly mounted on the front of the telescope, and cap or remove the finderscope when observing the Sun. Never use an eyepiece-type solar filter, and never use the telescope to project sunlight onto another surface: the internal heat build-up will damage the optical elements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSetting Up\u003c\/h3\u003e\n\u003cp\u003eAttach the tube to the mount of your choice, slide the red dot finder bracket into its slot and tighten its screw. Loosen the three thumbscrews at the end of the tube, insert the diagonal and retighten them, then insert an eyepiece in the diagonal and secure it. Remove the dust cap before viewing.\u003c\/p\u003e\n\u003cp\u003eTo align the red dot finder, open its battery cover and remove the plastic shipping cover over the 3-volt lithium battery, then turn the brightness control clockwise until it clicks. Center a bright object in a low-power eyepiece and, with both eyes open, turn the azimuth and altitude controls until the red dot merges with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Skymax 102 designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMaksutov-Cassegrains are take-anywhere telescopes, also ideal when working space is limited, with high-resolution, diffraction-limited optical systems multi-coated to maximize contrast and image sharpness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification can I use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide the telescope's focal length by the eyepiece's: the included Super 25mm gives 52x and the Super 10mm 130x. Sky-Watcher's rule of thumb is about 2x per mm of aperture under good conditions, and it lists 204x as the highest practical power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat eyepiece size does it take?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e1.25\". The focuser diameter is 1.25\", and the included diagonal and eyepieces are 1.25\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow faint can it see?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe faintest stellar magnitude for the 102mm Maksutov is 12.7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the 4.6 lb Skymax 102 OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 4.6 lb with accessories and has a pre-installed V-style dovetail rail for mounts with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e. The Maksutov tubes can also go on a standard photographic tripod.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the Sky-Watcher Skymax 102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy moving the primary mirror with the focusing knob at the rear. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time as the temperature changes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I align the included Red Dot Finder on the Skymax 102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOpen the battery cover and remove the plastic shipping cover over the 3-volt lithium battery, then turn the brightness control clockwise until it clicks. Center a bright object in a low-power eyepiece and, with both eyes open, turn the azimuth and altitude controls until the red dot merges with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces with the Skymax 102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The focuser, included star diagonal and eyepieces are all 1.25\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it easy to take along?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMaksutovs are take-anywhere telescopes, also ideal when working space is limited. The Skymax 102 is 12.25\" long and 4.6 lb with accessories, and a soft carrying case is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Skymax 102 need time to adjust to outside temperature?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No cool-down time is specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I view the Sun with it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly with a proper solar filter firmly mounted on the front of the telescope. Never look directly at the Sun through the telescope, cap or remove the finder, never use an eyepiece-type solar filter, and never project sunlight with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/12.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7 \/ Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003ePrimary Mirror Focusing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e12.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Diameter\u003c\/td\u003e\n\u003ctd\u003e4.625\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e4.6 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepieces\u003c\/td\u003e\n\u003ctd\u003eSuper 25mm \u0026amp; Super 10mm (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification (with included eyepieces)\u003c\/td\u003e\n\u003ctd\u003e52x \/ 130x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003eRed Dot Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eV-style Dovetail Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSkymax 102mm Maksutov-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSuper 25mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSuper 10mm Eyepiece (1.25\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRed Dot Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-style Dovetail Rail (pre-installed)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Maksutov-Manual.pdf?v=1790637199\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190462749,"sku":"SW-S11510","price":490.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Skymax-102-S11510-1__91769.1594170769.1280.1280.jpg?v=1684338444"},{"product_id":"sky-watcher-skymax-127","title":"Sky-Watcher Skymax 127","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm (5\") Maksutov-Cassegrain Optical Design\u003c\/li\u003e\n\u003cli\u003e1540mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/12.1 Focal Ratio\u003c\/li\u003e\n\u003cli\u003ePrimary Mirror Focusing Mechanism\u003c\/li\u003e\n\u003cli\u003eOTA Weighs 9.7 lbs with Accessories\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" 28mm Eyepiece, 6x30 Finder, and 2\" Diagonal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eSky-Watcher Skymax 127 Maksutov-Cassegrain Telescope\u003c\/h2\u003e\n      \u003cp\u003eThe \u003cstrong\u003eSky-Watcher Skymax 127\u003c\/strong\u003e is a 127mm (5\") \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutov-Cassegrain\u003c\/a\u003e from Sky-Watcher's Signature Series. It has a 1540mm focal length (f\/12.1) and a 9.7 lb tube with accessories, and includes a 2\" 28mm LET eyepiece (55x), a 2\" star diagonal and a 6x30 finderscope.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSignature Series Maksutov\u003c\/h3\u003e\n      \u003cp\u003eThe Signature Series is the new generation of Maksutovs, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e design.\u003c\/p\u003e\n          \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocal Length and Dimensions\u003c\/h3\u003e\n      \u003cp\u003eThe focal length is 1540mm (f\/12.1), with a 39mm secondary and a 15\" tube length with the diagonal, fully multi-coated lenses, BK7 glass and Radiant Aluminum Quartz (RAQ) mirror coatings.\u003c\/p\u003e\n      \u003cp\u003eskywatcher.com lists the 127mm Maksutov at 1500mm (f\/12), a 5 kg tube weight and 14 cm x 33 cm tube dimensions. The figures on this page follow Sky-Watcher USA.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMagnification\u003c\/h3\u003e\n      \u003cp\u003eMagnification is the telescope's focal length divided by the eyepiece's: 1540mm with the included 28mm eyepiece gives 55x.\u003c\/p\u003e\n      \u003cp\u003eSky-Watcher's rule of thumb is about 2x per mm of aperture under good conditions, which for 127mm is about 254x, because higher power also magnifies the air turbulence between the telescope and the subject.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eIncluded Diagonal, Eyepiece and Finder\u003c\/h3\u003e\n      \u003cp\u003eSky-Watcher USA includes a 2\" star diagonal, a 28mm LET 2\" eyepiece (55x), a 6x30 finderscope, a V-style dovetail rail and a dust cap.\u003c\/p\u003e\n      \u003cp\u003eThe \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e is a 1.25\" opening with a 2\" adapter, and the diagonal a 2\" 90 degree star diagonal with a 1.25\" adapter, so both 2\" and 1.25\" eyepieces can be used.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eFocusing\u003c\/h3\u003e\n      \u003cp\u003eFocus is by moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of small variations caused by temperature changes and flexures, and almost always after changing an eyepiece or adding or removing a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e.\u003c\/p\u003e\n          \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMounting\u003c\/h3\u003e\n      \u003cp\u003eThe tube weighs 9.7 lb with accessories (Sky-Watcher USA) and has a V-style dovetail rail, so use a mount with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e and a payload rating that covers it.\u003c\/p\u003e\n      \u003cp\u003eskywatcher.com lists its EQ3 Pro and EQ3 mounts (with aluminum or steel \u003ca href=\"\/collections\/tripods-and-piers\"\u003etripod\u003c\/a\u003e) as related products.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eTemperature and Care\u003c\/h3\u003e\n      \u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n      \u003cp\u003eReplace the dust cap when the telescope is not in use.\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eSolar Safety Warning:\u003c\/strong\u003e Never look directly at the Sun through the telescope: permanent eye damage will result. Use a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e firmly mounted on the front of the telescope, and cap or remove the finderscope when observing the Sun. Never use an eyepiece-type solar filter, and never use the telescope to project sunlight onto another surface: the internal heat build-up will damage the optical elements.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSetting Up\u003c\/h3\u003e\n      \u003cp\u003eFollow these steps:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMount the telescope:\u003c\/strong\u003e attach the tube to the mount of your choice.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInstall the finder:\u003c\/strong\u003e slide the finder bracket into its slot on the tube and tighten the screw. Like all finderscopes, it must be aligned with the main telescope before use.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInsert the diagonal:\u003c\/strong\u003e loosen the three thumbscrews at the end of the tube, insert the diagonal and retighten them.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInsert an eyepiece:\u003c\/strong\u003e loosen the screws on the diagonal, insert the eyepiece and retighten them. Remove the dust cap before viewing.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does it need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 9.7 lb with accessories (Sky-Watcher USA) and has a V-style dovetail rail, so use a mount with a Vixen-style saddle and a payload rating that covers it. skywatcher.com lists its EQ3 Pro and EQ3 mounts as related products.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide the telescope's focal length by the eyepiece's: 1540mm with a 28mm eyepiece gives 55x. Sky-Watcher's rule of thumb is about 2x per mm of aperture under good conditions, since air turbulence limits what you can use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Signature Series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Signature Series is the new generation of Maksutovs, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic Schmidt-Cassegrain design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my 1.25\" eyepieces with the Skymax 127?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The focuser is a 1.25\" opening with a 2\" adapter, and the diagonal a 2\" 90 degree star diagonal with a 1.25\" adapter, so both 2\" and 1.25\" eyepieces can be used.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes, and almost always after changing an eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes it need time to adjust to outside temperature?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow big and heavy is it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA lists it at 15\" long with the diagonal, 5.75\" in outer diameter and 9.7 lb with accessories; skywatcher.com lists a 5 kg tube and 14 cm x 33 cm tube dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there two different focal lengths listed for the Skymax 127?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA lists 1540mm (f\/12.1), and skywatcher.com lists the 127mm Maksutov at 1500mm (f\/12). The figures on this page follow Sky-Watcher USA.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the first step to setting up the Skymax 127 for my first night out?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAttach the tube to the mount of your choice and install the \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e. Loosen the three thumbscrews at the end of the tube, insert the diagonal and retighten them, then insert an eyepiece into the diagonal and secure it. The finder must be aligned with the main telescope before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I view the Sun with it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly with a proper solar filter firmly mounted on the front of the telescope. Never look directly at the Sun through the telescope, cap or remove the finderscope, never use an eyepiece-type solar filter, and never project sunlight with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat comes in the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Skymax 127 tube, a 28mm LET 2\" eyepiece, a 2\" star diagonal, a 6x30 finderscope, a V-style dovetail rail and a dust cap (Sky-Watcher USA).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1540mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/12.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant™ Aluminum Quartz™ (RAQ™) with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7\/Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e39mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003ePrimary Mirror Movement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (with diagonal)\u003c\/td\u003e\n\u003ctd\u003e15\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e5.75\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e9.7 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder Scope\u003c\/td\u003e\n\u003ctd\u003e6x30 Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eV-Style Dovetail Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e28mm LET (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification (with included eyepiece)\u003c\/td\u003e\n\u003ctd\u003e55x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSkymax 127 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e28mm LET 2\" Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e6x30 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-Style Dovetail Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Maksutov-Manual.pdf?v=1790637199\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190561053,"sku":"SW-S11520","price":850.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Skymax-127-S11520-1__09357.1594170770.1280.1280.jpg?v=1684338456"},{"product_id":"sky-watcher-skymax-150","title":"Sky-Watcher Skymax 150","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e151mm Maksutov-Cassegrain Optical Tube\u003c\/li\u003e\n\u003cli\u003e1800mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/12 Focal Ratio\u003c\/li\u003e\n\u003cli\u003ePrimary Mirror Focuser\u003c\/li\u003e\n\u003cli\u003eOptical Tube Weight (with accessories): 14 lbs\u003c\/li\u003e\n\u003cli\u003eIncludes 2-inch Star Diagonal and 28mm Eyepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Skymax 150 Maksutov-Cassegrain Telescope\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSky-Watcher Skymax 150\u003c\/strong\u003e is a 151mm Maksutov-Cassegrain from Sky-Watcher's Signature Series, with an 1800mm focal length (f\/12) and primary-mirror focusing. It weighs 14 lb with accessories and includes a 2\" star diagonal, a 2\" 28mm LET eyepiece (64.3x) and a 9x50 finderscope. The tube is 17.5\" long with the diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSignature Series Maksutov\u003c\/h3\u003e\n\u003cp\u003eThe Signature Series is the new generation of \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutovs\u003c\/a\u003e, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptics\u003c\/h3\u003e\n\u003cp\u003eA 166mm primary mirror serves the 151mm aperture, with a 47mm secondary. For the 150mm Maksutov, the highest practical power is 300x and the faintest stellar magnitude 13.2.\u003c\/p\u003e\n\u003cp\u003eThe 1800mm focal length fits in a tube 17.5\" long with the diagonal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture:\u003c\/strong\u003e 151mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary mirror:\u003c\/strong\u003e 166mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary:\u003c\/strong\u003e 47mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoatings:\u003c\/strong\u003e Radiant Aluminum Quartz (RAQ) mirror coatings with 94% reflectivity and fully multi-coated lenses (Sky-Watcher USA).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMagnification\u003c\/h3\u003e\n\u003cp\u003eThe magnification of a telescope is determined by dividing its focal length by the focal length of the eyepiece. For the Skymax 150, which has an 1800mm focal length, the included 28mm LET eyepiece provides a magnification of 64.3x (1800mm \/ 28mm).\u003c\/p\u003e\n\u003cp\u003eSky-Watcher's rule of thumb is about 2x per mm of aperture under good conditions, because higher power also magnifies the air turbulence between the telescope and the subject. skywatcher.com lists 300x as the highest practical power for the 150mm Maksutov.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFocusing and Included Accessories\u003c\/h3\u003e\n\u003cp\u003eFocus is by moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes and flexures, and almost always after changing an eyepiece or adding or removing a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThe package includes a V-style dovetail rail, dust caps and the following. The \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e is a 1.25\" opening with a 2\" adapter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" star diagonal:\u003c\/strong\u003e 90 degree, with a 1.25\" adapter per skywatcher.com.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e28mm LET eyepiece:\u003c\/strong\u003e 2\", giving 64.3x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9x50 finderscope:\u003c\/strong\u003e with bracket (Sky-Watcher USA; skywatcher.com lists an 8x50 \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSize, Weight and Mounting\u003c\/h3\u003e\n\u003cp\u003eSky-Watcher USA lists 14 lb with accessories, 17.5\" long with the diagonal and 7.5\" in outer diameter; skywatcher.com lists a 5.6 kg tube and 18.3 cm x 40 cm tube dimensions.\u003c\/p\u003e\n\u003cp\u003eA V-style dovetail rail attaches it to mounts with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e, and skywatcher.com lists its HEQ5 Pro and EQ5 Pro mounts as related products.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTemperature and Care\u003c\/h3\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n\u003cp\u003eReplace the dust caps when the telescope is not in use. Never look directly at the Sun through the telescope: permanent eye damage will result. Use a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e firmly mounted on the front of the telescope, and cap or remove the finderscope when observing the Sun. Never use an eyepiece-type solar filter, and never use the telescope to project sunlight onto another surface: the internal heat build-up will damage the optical elements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSetting Up\u003c\/h3\u003e\n\u003cp\u003eAttach the tube to the mount of your choice and install the finder: slide its bracket into the slot and tighten the screw. Loosen the three thumbscrews at the end of the tube, insert the diagonal and retighten them, then insert an eyepiece into the diagonal and secure it. Like all finderscopes, the finder must be aligned with the main telescope before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does it need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 14 lb with accessories (Sky-Watcher USA) and has a V-style dovetail rail, so use a mount with a Vixen-style saddle and a payload rating that covers it. skywatcher.com lists its HEQ5 Pro and EQ5 Pro mounts as related products.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification can I use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDivide the telescope's focal length by the eyepiece's: 1800mm with a 28mm eyepiece gives 64.3x. Sky-Watcher's rule of thumb is about 2x per mm of aperture under good conditions, since air turbulence limits what you can use, and skywatcher.com lists 300x as the highest practical power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Signature Series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Signature Series is the new generation of Maksutovs, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic Schmidt-Cassegrain design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes, and almost always after changing an eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the primary mirror 166mm when the aperture is 151mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary mirror is 166mm and the aperture 151mm; no reason is given for the difference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat eyepiece sizes does it take?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe focuser is a 1.25\" opening with a 2\" adapter, and the diagonal a 2\" 90 degree star diagonal with a 1.25\" adapter, so both 2\" and 1.25\" eyepieces can be used.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat finder is included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA includes a 9x50 finderscope with bracket; skywatcher.com lists an 8x50 finder for this Maksutov.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I view the Sun with it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly with a proper solar filter firmly mounted on the front of the telescope. Never look directly at the Sun through the telescope, cap or remove the finderscope, never use an eyepiece-type solar filter, and never project sunlight with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes it need time to adjust to outside temperature?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow faint can it see?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eskywatcher.com lists a faintest stellar magnitude of 13.2 for the 150mm Maksutov.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow big and heavy is it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA lists 14 lb with accessories, 17.5\" long with the diagonal and 7.5\" in outer diameter; skywatcher.com lists a 5.6 kg tube and 18.3 cm x 40 cm tube dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set up the Skymax 150 for the first time?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAttach the tube to the mount of your choice and install the finder. Loosen the three thumbscrews at the end of the tube, insert the diagonal and retighten them, then insert an eyepiece into the diagonal and secure it. Like all finderscopes, the finder must be aligned with the main telescope before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrue Aperture\u003c\/td\u003e\n\u003ctd\u003e151 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1800 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e166 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7\/Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e47 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003ePrimary Mirror Adjustment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e14 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length (with diagonal)\u003c\/td\u003e\n\u003ctd\u003e17.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e7.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e28mm LET (2-inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification (with included eyepiece)\u003c\/td\u003e\n\u003ctd\u003e64.3x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Finder\u003c\/td\u003e\n\u003ctd\u003e9x50 Optical Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Dovetail\u003c\/td\u003e\n\u003ctd\u003eV-style Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115308\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSkymax 150 Maksutov-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e28mm LET Eyepiece (2\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-style Dovetail Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Maksutov-Manual.pdf?v=1790637199\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190593821,"sku":"SW-S11530","price":1360.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Skymax-150-S11530-1__52671.1594170772.1280.1280.jpg?v=1684338469"},{"product_id":"sky-watcher-skymax-180","title":"Sky-Watcher Skymax 180","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e180mm Maksutov-Cassegrain Optical Tube\u003c\/li\u003e\n\u003cli\u003e2700mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/15 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eWeighs 19 lbs with Accessories\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" Diagonal and 28mm LET Eyepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Skymax 180 Maksutov-Cassegrain Telescope\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSky-Watcher Skymax 180\u003c\/strong\u003e is a 180mm \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutov-Cassegrain\u003c\/a\u003e from Sky-Watcher's Signature Series, with a 2700mm focal length (f\/15) and primary-mirror focusing. It is 22\" long with the diagonal and 19 lb with accessories, and includes a 2\" star diagonal, a 2\" 28mm LET eyepiece (96.4x) and a 9x50 finderscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSignature Series Maksutov\u003c\/h3\u003e\n\u003cp\u003eThe Signature Series is the new generation of Maksutovs, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptics\u003c\/h3\u003e\n\u003cp\u003eA 199mm primary mirror serves the 180mm aperture, with a 41mm secondary, fully multi-coated lenses and Sky-Watcher's Radiant Aluminum Quartz (RAQ) mirror coatings with 94% reflectivity. The 2700mm focal length fits in a tube 22\" long with the diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMagnification\u003c\/h3\u003e\n\u003cp\u003eDivide the telescope's focal length by the eyepiece's: 2700mm with the included 28mm eyepiece gives 96.4x.\u003c\/p\u003e\n\u003cp\u003eThe highest practical power for the 180mm Maksutov is 360x. As a rule of thumb, use about 2x per mm of aperture under good conditions, because higher power also magnifies the air turbulence between the telescope and the subject.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFocusing and Included Accessories\u003c\/h3\u003e\n\u003cp\u003eFocus is by moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes and flexures, and almost always after changing an eyepiece or adding or removing a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e. The package includes the following:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" star diagonal:\u003c\/strong\u003e 90 degree, with a 1.25\" adapter. The \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e is a 1.25\" opening with a 2\" adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e28mm LET eyepiece:\u003c\/strong\u003e 2\", giving 96.4x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9x50 finderscope:\u003c\/strong\u003e skywatcher.com lists an 8x50 \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting\u003c\/h3\u003e\n\u003cp\u003eIt weighs 19 lb with accessories (Sky-Watcher USA) and has a V-style dovetail bar, so use a mount with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e and a payload rating that covers it.\u003c\/p\u003e\n\u003cp\u003eskywatcher.com lists its AZ-EQ6 Pro, EQ6 Pro and HEQ5 Pro mounts as related products.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTemperature and Solar Safety\u003c\/h3\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n\u003cp\u003eNever look directly at the Sun through the telescope: permanent eye damage will result. Use a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e firmly mounted on the front of the telescope, and cap or remove the finderscope when observing the Sun. Never use an eyepiece-type solar filter, and never use the telescope to project sunlight onto another surface: the internal heat build-up will damage the optical elements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSize and Weight\u003c\/h3\u003e\n\u003cp\u003eSky-Watcher USA lists 22\" long with the diagonal, 8.625\" in outer diameter and 19 lb with accessories; skywatcher.com lists a 7.8 kg tube and 21.6 cm x 50 cm tube dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSetting Up\u003c\/h3\u003e\n\u003cp\u003eFollow these steps:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eAttach the tube to the mount of your choice.\u003c\/li\u003e\n\u003cli\u003eSlide the finder bracket into its slot and tighten the screw. Like all finderscopes, the finder must be aligned with the main telescope before use.\u003c\/li\u003e\n\u003cli\u003eLoosen the three thumbscrews at the end of the tube.\u003c\/li\u003e\n\u003cli\u003eInsert the diagonal and retighten the thumbscrews.\u003c\/li\u003e\n\u003cli\u003eInsert an eyepiece into the diagonal and secure it.\u003c\/li\u003e\n\u003cli\u003eRemove the dust cap before viewing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does it need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 19 lb with accessories (Sky-Watcher USA) and has a V-style dovetail bar, so use a mount with a Vixen-style saddle and a payload rating that covers it. skywatcher.com lists its AZ-EQ6 Pro, EQ6 Pro and HEQ5 Pro mounts as related products.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Signature Series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Signature Series is the new generation of Maksutovs, manufactured to high levels of optical and mechanical precision, and in many applications their sharpness and image quality match and exceed those of the classic Schmidt-Cassegrain design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy moving the primary mirror. Turn the focus knob slowly one way or the other until the image is sharp. The image usually needs fine refocusing over time because of temperature changes, and almost always after changing an eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" eyepieces with the Skymax 180?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The included 2\" star diagonal comes with a 1.25\" adapter, and the focuser is a 1.25\" opening with a 2\" adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes it need time to adjust to outside temperature?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe image usually needs fine refocusing over time as the telescope adjusts to temperature changes, particularly before it has reached outside temperature. No specific cool-down time is given.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the highest useful magnification for the Skymax 180?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe highest practical power for the 180mm Maksutov is 360x. As a rule of thumb, use about 2x per mm of aperture under good conditions, since air turbulence limits what you can use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the primary mirror 199mm when the aperture is 180mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary mirror is 199mm and the aperture 180mm; no reason is given for the difference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I view the Sun with it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly with a proper solar filter firmly mounted on the front of the telescope. Never look directly at the Sun through the telescope, cap or remove the finderscope, never use an eyepiece-type solar filter, and never project sunlight with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat magnification does the included eyepiece give?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a 2\" 28mm LET eyepiece giving 96.4x: magnification is the focal length divided by the eyepiece's, 2700mm \/ 28mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow big and heavy is it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA lists 22\" long with the diagonal, 8.625\" in outer diameter and 19 lb with accessories; skywatcher.com lists a 7.8 kg tube and 21.6 cm x 50 cm tube dimensions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat finder is included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher USA includes a 9x50 finderscope; skywatcher.com lists an 8x50 finder for this Maksutov.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrue Aperture\u003c\/td\u003e\n\u003ctd\u003e180 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Aperture\u003c\/td\u003e\n\u003ctd\u003e199 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2700 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7 \/ Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e41 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003ePrimary Mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e22\" (with diagonal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e8.625\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e19 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder Scope\u003c\/td\u003e\n\u003ctd\u003e9x50 Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eV-style Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Eyepiece\u003c\/td\u003e\n\u003ctd\u003e28mm LET (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification (with included eyepiece)\u003c\/td\u003e\n\u003ctd\u003e96.4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115407\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSkymax 180 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e9x50 Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Star Diagonal with 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e28mm LET Eyepiece (2\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Maksutov-Manual.pdf?v=1790637199\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190659357,"sku":"SW-S11540","price":2330.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Skymax-180-S11540-1__02494.1594170773.1280.1280.jpg?v=1684338481"},{"product_id":"sky-watcher-starlux-190mn","title":"Sky-Watcher Starlux 190MN","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e190mm Maksutov-Newtonian Optical Design\u003c\/li\u003e\n\u003cli\u003e1000mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/5.3 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e64mm Secondary Mirror\u003c\/li\u003e\n\u003cli\u003e2\" Dual-Speed Crayford Focuser\u003c\/li\u003e\n\u003cli\u003e12.5 kg OTA Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSky-Watcher Starlux 190MN\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher Starlux 190MN is a 190mm Maksutov-Newtonian with a 1000mm focal length (f\/5.3), just what astrophotographers and serious visual observers have been looking for. It has a 2\" dual-speed Crayford \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e and a 64mm secondary mirror, and the tube weighs 12.5 kg.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 190mm f\/5.3 Maksutov-Newtonian\u003c\/h3\u003e\n\u003cp\u003eThe Mak-Newtonian design provides large-aperture apochromatic performance with exceptional field correction in a compact, affordable package, and yields a sharper and more contrasty image than a similarly sized Schmidt-Newtonian. It is an excellent visual performer too.\u003c\/p\u003e\n\u003cp\u003eThe highest practical power is 380x, and the telescope is recommended for deep-sky observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSchott Glass and a 64mm Secondary\u003c\/h3\u003e\n\u003cp\u003eSky-Watcher's Maksutov-Newtonians use Schott glass for the positive front crown element in the objective. Schott is the recognized world leader in glass for precision optical lens systems.\u003c\/p\u003e\n\u003cp\u003eA large 64mm secondary mirror increases field illumination for larger CCDs. The secondary obstruction is 34% by diameter and 11% by area. The lenses are fully multi-coated, and the mirrors carry Sky-Watcher's Radiant Aluminum Quartz (RAQ) coatings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField Correction and Camera Connection\u003c\/h3\u003e\n\u003cp\u003eThe design gives exceptional field correction. Whether a corrector or \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflattener\u003c\/a\u003e is needed for imaging is not stated.\u003c\/p\u003e\n\u003cp\u003eA 2\" T-ring adapter and a 1.25\" eyepiece adapter are included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Precision 2\" Dual-Speed Crayford Focuser\u003c\/h3\u003e\n\u003cp\u003eFocus is by a mechanically ultra-smooth, backlash-free, precision 2\" Crayford focuser assembly with fine and ultra-fine focusing adjustments, standard on the Starlux 190MN.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" drawtube:\u003c\/strong\u003e takes 2\" accessories; the included 1.25\" adapter takes 1.25\" eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 12.5 kg Steel Tube\u003c\/h3\u003e\n\u003cp\u003eThe tube is rolled steel, powder-coated reflective gloss black with a gold fleck accent; the front and back cells are cast aluminum. The tube weighs 12.5 kg and measures 19.5 cm x 93.5 cm.\u003c\/p\u003e\n\u003cp\u003eTube rings and a V-style dovetail bar are included, with a right-angle correct-image 8x50 \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting\u003c\/h3\u003e\n\u003cp\u003eThe tube weighs 12.5 kg and comes with rings on a V-style dovetail bar. The AZ-EQ6 Pro and EQ6 Pro mounts are related products; choose a mount whose payload rating covers the tube, camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSolar Safety\u003c\/h3\u003e\n\u003cp\u003eNever point the telescope or its finder at the Sun without a proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filter\u003c\/a\u003e securely covering the front of the telescope: looking at the Sun through it will cause permanent eye damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does it need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 12.5 kg and comes with rings on a V-style dovetail bar. The AZ-EQ6 Pro and EQ6 Pro mounts are related products; choose a mount whose payload rating covers the tube, camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it good for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Mak-Newtonian is an excellent visual performer too, with a highest practical power of 380x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow well corrected is the field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Mak-Newtonian design gives large-aperture apochromatic performance with exceptional field correction. Whether a corrector or flattener is needed for imaging is not stated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does it compare with a Schmidt-Newtonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Mak-Newtonian yields a sharper and more contrasty image than a similarly sized Schmidt-Newtonian.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Schott glass used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSky-Watcher's Maksutov-Newtonians use Schott glass for the positive front crown element in the objective. Schott is the recognized world leader in glass for precision optical lens systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size is the secondary mirror?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e64mm. It increases field illumination for larger CCDs; the obstruction is 34% by diameter and 11% by area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is included with the Starlux 190MN OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube, an 8x50 right-angle correct-image finderscope, tube rings, a V-style dovetail bar, a 2\" T-ring adapter and a 1.25\" eyepiece adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is it best suited to?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is recommended for deep-sky observing, and the Mak-Newtonian is just what astrophotographers and serious visual observers have been looking for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow big and heavy is the tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 12.5 kg and measures 19.5 cm x 93.5 cm, in rolled steel with cast aluminum front and back cells.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the focuser on the Starlux 190MN?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA mechanically ultra-smooth, backlash-free, precision 2\" Crayford focuser with fine and ultra-fine focusing adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat finder is included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8x50 finder, a right-angle correct-image finderscope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces with the Starlux 190MN?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2\" focuser takes 2\" eyepieces, and a 1.25\" adapter is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Newtonian\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e190mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eRadiant Aluminum Quartz (RAQ)™ with 94% reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eBK7\/Borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Diameter\u003c\/td\u003e\n\u003ctd\u003e64mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Dual Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e93.5 cm, tube diameter 19.5 cm (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight (with accessories)\u003c\/td\u003e\n\u003ctd\u003e12.5 kg (27.6 lb) tube (skywatcher.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e050234115506\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eStarlux 190MN OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8x50 Right-Angle Correct-Image Finderscope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings (set)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eV-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" T-Ring Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher_Newtonian_Dobsonian_Collimation_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Collimation Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/sky-watcher-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSky-Watcher 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sky-Watcher","offers":[{"title":"Default Title","offer_id":44967190692125,"sku":"SW-S11550","price":3300.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Sky-Watcher-Starlux-190MN-S11550-1__39663.1594170774.1280.1280.jpg?v=1684338426"},{"product_id":"explore-scientific-firstlight-127mm-mak-cassegrain","title":"Explore Scientific FirstLight 127mm Mak-Cassegrain","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm (5\") Maksutov-Cassegrain Optical Tube\u003c\/li\u003e\n\u003cli\u003e1900mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/15 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eIncludes 25mm Plössl Eyepiece \u0026amp; 1.25\" Diagonal\u003c\/li\u003e\n\u003cli\u003eSmartphone Adapter for Basic Astrophotography\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific FirstLight 127mm Mak-Cassegrain Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FirstLight 127mm Mak-Cassegrain delivers high-power planetary and lunar views through its long 1900mm focal length and high-contrast f\/15 optical system. This 127mm aperture \u003ca href=\"\/collections\/maksutov-cassegrain-telescopes\"\u003eMaksutov\u003c\/a\u003e design comes with a 25mm Plössl eyepiece and a 1.25\" 90° diagonal for immediate observation of the night sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 127mm f\/15 Maksutov-Cassegrain Optical System\u003c\/h3\u003e\n\u003cp\u003eThe Maksutov-Cassegrain design is renowned for producing sharp, refractor-like images in a compact package. With a 127mm aperture, this telescope gathers enough light for detailed views of Jupiter's cloud bands, Saturn's rings, and countless lunar craters. The slow f\/15 focal ratio darkens the sky background, significantly increasing contrast on bright objects and making it easier to split tight double stars.\u003c\/p\u003e\n\u003cp\u003eFully multi-coated optics ensure that the maximum amount of light reaches the included 25mm Plössl eyepiece. This combination of a long 1900mm focal length and a sealed optical tube minimizes air currents and requires virtually no maintenance, delivering consistently crisp views every time you observe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCompact Form, 1900mm Reach: A \"Grab-and-Go\" Design\u003c\/h3\u003e\n\u003cp\u003eDespite its powerful 1900mm focal length, the FirstLight 127mm Mak features a remarkably short and portable optical tube. This makes it an ideal \"grab-and-go\" instrument for quick backyard sessions or for travel to dark-sky sites without sacrificing optical power.\u003c\/p\u003e\n\u003cp\u003eThe primary trade-off for this high-magnification design is a narrow field of view. While not suited for sweeping views of the largest nebulae like the North American Nebula (NGC 7000), it excels at framing smaller, brighter targets like the Ring Nebula (M57) or the Hercules Cluster (M13) against a dark sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eReady for Viewing with a 25mm Plössl and Smartphone Adapter\u003c\/h3\u003e\n\u003cp\u003eThis package includes everything you need to start observing as soon as you mount the telescope. The 25mm Plössl eyepiece is a solid general-purpose choice, while the 1.25\" 90° star diagonal provides comfortable viewing angles for objects high in the sky. Locating targets is simplified with the included red-dot finder.\u003c\/p\u003e\n\u003cp\u003eFor those looking to share their discoveries, the included smartphone adapter allows you to quickly capture images of the Moon and bright planets through the eyepiece. It's a straightforward way to begin your journey into basic astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFirstLight 127mm Mak vs. a 5\" Schmidt-Cassegrain: Planetary Focus\u003c\/h3\u003e\n\u003cp\u003eCompared to a standard 5-inch \u003ca href=\"\/collections\/schmidt-cassegrain-telescopes\"\u003eSchmidt-Cassegrain\u003c\/a\u003e (SCT), which typically has an f\/10 focal ratio and a 1250mm focal length, the FirstLight 127mm Mak is a more specialized instrument.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSCT Advantage:\u003c\/strong\u003e An f\/10 SCT offers a wider true field of view with the same eyepiece, making it slightly more versatile for observing larger star clusters and brighter deep-sky objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirstLight 127mm Mak Advantage:\u003c\/strong\u003e The Mak's longer 1900mm focal length achieves significantly higher magnification with any given eyepiece, a distinct benefit for planetary observation. The design's smaller central obstruction also tends to produce higher-contrast images, critical for resolving fine details on planetary surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the FirstLight 127mm Mak-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a sturdy astronomical mount with a Vixen-style \u003ca href=\"\/collections\/saddles-and-clamps\"\u003edovetail saddle\u003c\/a\u003e. For visual use, a manual \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth mount\u003c\/a\u003e like an Explore Scientific Twilight I or a small computerized GoTo mount like a Celestron NexStar SLT would be an excellent choice for the FirstLight 127mm Mak.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/15 focal ratio of the FirstLight 127mm Mak affect viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ef\/15 focal ratio\u003c\/strong\u003e is considered \"slow,\" which has several key advantages for planetary and lunar viewing. It provides high magnification with standard eyepieces, increases image contrast by darkening the sky background, and is very forgiving of less-expensive eyepiece designs. The main trade-off is a narrower field of view compared to \"faster\" telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I do astrophotography with the Explore Scientific FirstLight 127mm Mak?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for basic imaging. The included smartphone adapter is perfect for taking snapshots of the Moon and bright planets like Jupiter and Saturn. For more serious deep-sky imaging, the f\/15 focal ratio would require very long exposures, making a different type of telescope a better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the FirstLight 127mm Mak good for deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can certainly see bright deep-sky objects, the FirstLight 127mm Mak's long focal length and narrow field of view are not ideal for very large targets like the Orion Nebula (M42) or the Andromeda Galaxy (M31). It is better suited for smaller, concentrated targets like globular clusters (e.g., M13) and planetary nebulae (e.g., M57).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the maximum useful magnification for the FirstLight 127mm Mak on a target like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA general rule for maximum useful magnification is 50x per inch of aperture (or 2x per millimeter). For the \u003cstrong\u003e127mm\u003c\/strong\u003e FirstLight Mak, this is approximately 254x. On nights of excellent atmospheric seeing, you could push the magnification to this level to see fine details in Jupiter's cloud belts, though on average nights, 150x to 200x will provide a more consistently sharp view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the included smartphone adapter with the FirstLight 127mm Mak?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, insert an eyepiece (like the included \u003cstrong\u003e25mm Plössl\u003c\/strong\u003e) into the diagonal and bring an object into sharp focus. Then, clamp your smartphone into the adapter, aligning its camera lens with the center of the eyepiece. Attach the adapter to the eyepiece, turn on your phone's camera app, and you should see the object on your screen, ready to be photographed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1900mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMaksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptics\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Included\u003c\/td\u003e\n\u003ctd\u003e25mm Plössl\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Included\u003c\/td\u003e\n\u003ctd\u003e1.25\" 90° Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinder Included\u003c\/td\u003e\n\u003ctd\u003eRed-Dot Finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803033443\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube with accessories)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFirstLight 127mm Maksutov-Cassegrain OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e25mm Plössl Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" 90° Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRed-Dot Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSmartphone Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967203602717,"sku":"ES-FL-MC1271900","price":699.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FirstLight-127mm-Mak-Cassegrain-FL-MC1271900-1__24116.1594240369.1280.1280.jpg?v=1684338949"},{"product_id":"explore-scientific-ar127-doublet-refractor","title":"Explore Scientific AR127 Doublet Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm Achromatic Doublet Refractor\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Crown-and-Flint Optics\u003c\/li\u003e\n\u003cli\u003eDual-Speed Focuser for Fine Adjustment\u003c\/li\u003e\n\u003cli\u003eDielectric-Coated Diagonal Included\u003c\/li\u003e\n\u003cli\u003eCradle Ring Assembly with Vixen-Style Dovetail\u003c\/li\u003e\n\u003cli\u003e8x50 Straight-Through Finderscope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific AR127 Doublet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific AR127 refractor uses a classic 127mm air-spaced, crown-and-flint doublet objective to deliver high-contrast, sharp images of celestial objects at a fraction of the cost of a true apochromatic design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe AR127's 127mm Air-Spaced Doublet Lens\u003c\/h3\u003e\n\u003cp\u003eThis telescope's optical heart is its 127mm (5-inch) achromatic objective lens. The air-spaced doublet design, using traditional crown and flint glasses, provides sharp, detailed views of the Moon, planets, and deep-sky objects. It gathers significantly more light than smaller \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, resolving details like Jupiter's cloud bands and the Cassini Division in Saturn's rings.\u003c\/p\u003e\n\u003cp\u003eAs an \u003ca href=\"\/collections\/achromatic-refractors\"\u003eachromatic refractor\u003c\/a\u003e, its primary strength is exceptional contrast for its aperture class. However, a degree of chromatic aberration, or false color, is inherent to the design and will be visible as a slight violet halo around the brightest stars and planetary limbs. This is a well-understood trade-off for achieving this level of aperture and portability at this price point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for Outreach: Heavy-Duty Focuser and Mounting\u003c\/h3\u003e\n\u003cp\u003eDesigned to withstand the rigors of frequent transport and use at star parties, the AR127 is equipped with robust, professional-grade components. The OTA includes a smooth, dual-speed focuser, allowing for both coarse and fine focus adjustments critical for achieving sharp images at high magnification. A high-reflectivity 2-inch dielectric diagonal is included to ensure maximum light transmission to the \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThe package is completed with a sturdy cradle ring assembly that attaches to a Vixen-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e, making it compatible with a wide range of popular German equatorial and \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth mounts\u003c\/a\u003e. An 8x50 straight-through finderscope with a quick-release bracket is also included to help you locate and center objects in the main eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of views can I expect from the AR127 on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 127mm aperture, the AR127 will provide bright, detailed views of the Orion Nebula (M42). You can expect to resolve the four main stars of the Trapezium at the nebula's core and see extensive nebulosity stretching across the field of view, especially from a dark-sky site. The fast f\/6.5 focal ratio makes it well-suited for framing large deep-sky objects like this.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the AR127's achromatic design handle bright objects like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe AR127 will show significant detail on Jupiter, including its main equatorial belts, zones, and the Great Red Spot. However, because it is an achromatic refractor, you will notice a faint purple or violet halo around the planet's limb. This is known as chromatic aberration and is a normal characteristic of this optical design. Using a light yellow or a specialized fringe-killer filter can help reduce this effect and improve contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific AR127 suitable for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the AR127 can be used for astrophotography, particularly for lunar and planetary imaging where its sharpness is an asset. For deep-sky imaging, the inherent chromatic aberration will cause stars to appear bloated with colored halos. This can be managed with specialized filters and processing techniques, but for serious deep-sky work, an apochromatic (APO) refractor is generally recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat type of mount is recommended for the AR127 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA sturdy \u003ca href=\"\/collections\/equatorial-mounts\"\u003eGerman equatorial mount\u003c\/a\u003e like the Explore Scientific iEXOS-100, Celestron Advanced VX, or Sky-Watcher EQM-35 is a good match for visual use and light imaging with the AR127. For more serious astrophotography, a mount with a higher payload capacity is recommended to handle the telescope and additional camera gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the AR127's dual-speed focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe dual-speed focuser provides two focusing knobs. The larger knob allows for rapid, coarse adjustments to quickly find the general focus point. The smaller knob offers a fine-adjustment ratio (typically 10:1), enabling you to make very small, precise changes to achieve critical sharpness, which is especially important for high-magnification planetary viewing and astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I get optical test data for my specific AR127 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Explore Scientific offers interferometric optical data for your specific telescope upon request. You must own the telescope for at least 120 days before contacting their customer service to request the report for your serial number.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010974\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Crown-and-Flint Achromatic Doublet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e826mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003e2\" Dual-Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e863 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e130.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e15 lbs (6.8 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eVixen-Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAR127 OTA with 2\" dual-speed focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOne-piece 2\" diagonal, 99% dielectric\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8x50 non-illuminated straight-through finderscope with quick-release bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCradle ring assembly with Vixen-style dovetail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967204684061,"sku":"ES-DAR127065-02","price":840.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-AR127-Air-Spaced-Doublet-Refractor-Telescope-DAR127065-01-DAR127065-01-1__42087.1594240382.1280.1280.jpg?v=1684338987"},{"product_id":"explore-scientific-ar152-doublet-refractor","title":"Explore Scientific AR152 Doublet Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e152mm (6-inch) Aperture\u003c\/li\u003e\n\u003cli\u003ef\/6.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Doublet Achromatic Optics\u003c\/li\u003e\n\u003cli\u003e2\" Dual-Speed Focuser\u003c\/li\u003e\n\u003cli\u003e2\" Diagonal with 99% Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003e8x50 Straight-Through Finderscope\u003c\/li\u003e\n\u003cli\u003eVixen-Style Dovetail\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific AR152 Doublet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific AR152 Doublet Refractor combines a large 152mm (6-inch) aperture with a fast f\/6.5 focal ratio for bright, wide-field views of deep-sky objects. Its air-spaced, diffraction-limited optics are paired with a robust 2-inch dual-speed focuser, a 99% reflective 2-inch dielectric diagonal, and an 8x50 finder scope, delivering a complete optical tube assembly ready for your mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e152mm f\/6.5 Optics: Bright, Wide-Field Achromatic Views\u003c\/h3\u003e\n\u003cp\u003eWith a 152mm objective, this \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e gathers a significant amount of light, revealing faint details in galaxies and bringing out the structure in nebulae like the Orion Nebula (M42). The f\/6.5 focal ratio creates a wide true field of view, making it easy to frame large star clusters and sweeping portions of the Milky Way. The classic crown-and-flint doublet design offers sharp, high-contrast images at an unmatched value.\u003c\/p\u003e\n\u003cp\u003eAs an \u003ca href=\"\/collections\/achromatic-refractors\"\u003eachromatic refractor\u003c\/a\u003e, the AR152 will exhibit some chromatic aberration, or \"false color,\" visible as a slight violet halo around the brightest stars and the limb of the Moon. This is an inherent trade-off for achieving such a large aperture in a refractor at this price point. For deep-sky observation, this effect is often negligible and is a small price to pay for the bright, immersive views the 6-inch objective provides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for Outreach: A 2\" Dual-Speed Focuser and Heavy-Duty Components\u003c\/h3\u003e\n\u003cp\u003eEngineered for durability, the AR152 is built to handle the demands of public star parties and frequent use. The optical tube is equipped with a smooth 2-inch dual-speed focuser, allowing for rapid coarse adjustments and critical fine-tuning for sharp planetary detail or astrophotography. This precision is essential for getting the most out of the telescope's high-resolution optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Dielectric Diagonal:\u003c\/strong\u003e The included one-piece diagonal features 99% reflective dielectric coatings, ensuring minimal light loss for the brightest possible images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8x50 Finder Scope:\u003c\/strong\u003e The large 8x50 straight-through finderscope makes locating celestial objects simple and intuitive. It mounts to the new Hybrid 2N1 Finder Scope Base via a quick-release bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVixen-Style Dovetail:\u003c\/strong\u003e A standard Vixen-style dovetail is attached to the cradle ring, providing secure and broad compatibility with a wide range of popular \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth\u003c\/a\u003e and \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAR152 vs. an ED APO: The Aperture-for-Cost Trade-Off\u003c\/h3\u003e\n\u003cp\u003eWhen considering the AR152, many observers weigh it against smaller, more expensive apochromatic (APO) refractors. The choice comes down to your primary observing targets and budget.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPO Advantage:\u003c\/strong\u003e An ED \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eApochromatic refractor\u003c\/a\u003e, such as a 127mm model, will deliver views that are virtually free of chromatic aberration. This results in textbook-perfect color correction on bright stars, planets, and the Moon, which is a significant advantage for planetary imagers and visual purists.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAR152 Advantage:\u003c\/strong\u003e The 152mm aperture of the AR152 gathers over 40% more light than a 127mm telescope. This increase in light grasp means fainter deep-sky objects will appear brighter and more detailed. For observers focused on galaxies, nebulae, and star clusters, the extra aperture is often the deciding factor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUltimately, the AR152 offers more light-gathering power and higher resolution for the dollar. If your passion is deep-sky observing and you can accept a minor amount of false color on the brightest targets, the AR152 delivers impressive views and exceptional value.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Explore Scientific AR152 over a smaller apochromatic refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary reason is \u003cstrong\u003eaperture\u003c\/strong\u003e. The AR152's 152mm objective collects significantly more light than smaller APOs (e.g., 102mm or 127mm), resulting in brighter images of faint deep-sky objects like galaxies and nebulae. While an APO offers superior color correction, the AR152 provides greater light-gathering power for a lower cost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is best for the Explore Scientific AR152?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe AR152 is a substantial optical tube. You will need a sturdy mount with a payload capacity of at least 30-35 lbs to ensure stability, especially in windy conditions. For visual use, a robust alt-azimuth mount like an Explore Scientific Twilight II or a Sky-Watcher AZ-EQ5 would work well. For astrophotography, a German Equatorial Mount in the Celestron CGEM II or \u003ca href=\"\/products\/ioptron-cem40-mount\"\u003eiOptron CEM40\u003c\/a\u003e class is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the AR152 perform on planets like Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe AR152's 152mm aperture provides high resolution capable of showing significant planetary detail. You can expect to see Jupiter's main cloud belts, the Great Red Spot, and its four Galilean moons. On Saturn, the Cassini Division in the rings will be clearly visible, along with cloud bands on the planet itself. Due to its achromatic design, you will notice a violet fringe around the bright planetary disks, which can be reduced with a fringe-killer or minus-violet filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the chromatic aberration of the AR152 a problem for deep-sky viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most deep-sky objects, chromatic aberration is not a significant issue. Nebulae and galaxies are diffuse and lack the hard, high-contrast edges that make false color prominent. The effect is most noticeable on bright, pinpoint stars, where you may see a soft violet halo. Most deep-sky observers find the bright, wide-field views from the 6-inch aperture to be a worthwhile trade-off.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch eyepieces and filters with the AR152?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific AR152 comes standard with a 2-inch dual-speed focuser and a 2-inch 99% dielectric diagonal. This allows you to use 2-inch \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e for wide, immersive views and 2-inch filters, such as UHC or O-III filters for enhancing nebula observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I expect to see in the Orion Nebula (M42) with the AR152 from a suburban location?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a suburban backyard, the AR152's 6-inch aperture will provide stunning views of the Orion Nebula (M42). You will easily resolve the four main stars of the Trapezium cluster at its core. The bright, gaseous wings of the nebula will show intricate wisps and mottling, and with a \u003ca href=\"\/collections\/nebula-filters\"\u003eUHC filter\u003c\/a\u003e, you can trace the faint outer loops of nebulosity much further than with a smaller telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e152mm (6 inches)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Crown-and-Flint Achromatic Doublet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptics\u003c\/td\u003e\n\u003ctd\u003eDiffraction-Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2-inch Dual-Speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal\u003c\/td\u003e\n\u003ctd\u003e2-inch with 99% Dielectric Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e8x50 Straight-Through on Quick-Release Bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eCradle Ring with Vixen-Style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257011032\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e988mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e1041 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e157.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e23 lbs (10.7 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAR152 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Dual-Speed Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Diagonal with 99% Dielectric Coatings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8x50 Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCradle Ring with Vixen-Style Dovetail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid 2N1 Finder Scope Base\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore_Scientific_Introduction_Booklet_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207272733,"sku":"ES-DAR152065-02","price":1189.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-AR152-Air-Spaced-Doublet-Refractor-DAR152065-01-DAR152065-01-1__14562.1594240384.1280.1280.jpg?v=1684338861"},{"product_id":"explore-scientific-ed102-essential-series-triplet-apo-refractor","title":"Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eGenuine HOYA FCD1 ED Glass\u003c\/li\u003e\n\u003cli\u003e2\" Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eED102 Essential Series Air-Spaced Triplet APO Refractor Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED102 Essential Series Refractor combines a 102mm aperture with an f\/7 focal ratio in a true apochromatic, air-spaced triplet design for color-free, high-contrast views. Its genuine HOYA FCD1 glass element virtually eliminates chromatic aberration, delivering pristine images to the robust 2-inch rack-and-pinion focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTrue Apochromatic Correction: The 102mm f\/7 Air-Spaced Triplet\u003c\/h3\u003e\n\u003cp\u003eAt the core of the ED102 is an air-spaced triplet objective lens featuring a genuine HOYA FCD1 extra-low dispersion glass element. This apochromatic design brings red, green, and blue wavelengths to a single, sharp focus, effectively eliminating the distracting purple fringing seen in simpler refractors. Views of bright targets like Jupiter's cloud bands, Saturn's rings, and the lunar terminator are rendered with stark, high-contrast detail against a black sky background, thanks to proprietary EMD multi-layer coatings that maximize light transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Focus: The 2\" Rack-and-Pinion System\u003c\/h3\u003e\n\u003cp\u003eDesigned for both visual observers and astrophotographers, the ED102 includes a heavy-duty 2-inch rack-and-pinion focuser. This design provides the rigidity needed to support a full imaging train—including a DSLR or dedicated astronomy camera, filter wheel, and off-axis guider—without flexure or image shift. The large 2-inch barrel accepts wide-field eyepieces for expansive views and provides an unvignetted light path for larger camera sensors, while included extension tubes ensure you can reach focus with a variety of accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED102 Triplet vs. ED Doublet: Why Three Lenses Matter\u003c\/h3\u003e\n\u003cp\u003eA common decision for refractor buyers is choosing between a two-lens ED doublet and a three-lens apochromatic triplet like the ED102. While an ED doublet offers good color correction, the triplet design provides a superior level of performance, particularly for imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor Correction:\u003c\/strong\u003e A doublet brings two primary wavelengths to focus, leaving a residual \"secondary spectrum\" that can appear as slight violet halos on the brightest stars. The ED102's triplet design corrects for three wavelengths, suppressing this secondary spectrum for true-to-life star colors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstrophotography:\u003c\/strong\u003e The superior color correction of the triplet is critical for astrophotography. It prevents bloated, purple stars and allows for longer exposures that capture faint, natural-color nebulosity without chromatic artifacts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast:\u003c\/strong\u003e By focusing all colors more tightly, the triplet objective concentrates more light into a single point. This increases image contrast, making it easier to resolve fine details like the Cassini Division in Saturn's rings or delicate dust lanes in galaxies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the ED102 Essential refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, a stable alt-azimuth mount like an Explore Scientific Twilight I or a Vixen Porta II is sufficient. For long-exposure astrophotography, a German equatorial mount with GoTo capability, such as an Explore Scientific EXOS2-GT, Celestron AVX, or Sky-Watcher HEQ5, is required to handle the telescope's weight and provide accurate tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific ED102 suitable for planetary imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The ED102's apochromatic optics deliver the high-contrast, color-pure images needed to capture fine details on planets. When paired with a high-speed planetary camera and a 2x or 3x Barlow lens, you can resolve features like the Great Red Spot on Jupiter, cloud bands on Saturn, and polar caps on Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED102 perform on deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 102mm aperture gathers significant light for deep-sky observing and imaging. On the Orion Nebula (M42), you will be able to resolve the four main stars of the Trapezium cluster set against detailed nebulosity. For imaging, the f\/7 focal ratio is fast enough to capture the nebula's faint outer structures with moderate exposure times, while the triplet optics ensure the bright core stars remain sharp and color-correct.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of HOYA FCD1 glass in the ED102's triplet lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eHOYA FCD1\u003c\/strong\u003e is a high-grade, extra-low dispersion (ED) glass. Its specific optical properties allow it to bend different colors of light at very similar angles. When used as the central element in the ED102's triplet lens, it dramatically reduces chromatic aberration, resulting in sharper, higher-contrast images without false color.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch eyepieces and accessories with the ED102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific ED102 comes standard with a 2-inch focuser. This allows you to use 2-inch diagonals and wide-field eyepieces for sweeping, low-power views of large objects like the Andromeda Galaxy (M31) or the Pleiades (M45). It also ensures a wide, unvignetted illumination field for astrophotography with larger sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"air-spaced triplet\" mean for the ED102's optics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \"air-spaced triplet\" refers to an objective lens made of three separate glass elements separated by a thin cushion of air. This design gives optical engineers more variables to work with compared to a cemented or oil-spaced lens, allowing for a higher degree of correction for optical aberrations like chromatic aberration and spherical aberration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eED Glass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Rack-and-Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570149582\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eED102 Essential Series Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFocuser Extension Tubes\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 set\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore_Scientific_Introduction_Booklet_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207338269,"sku":"ES-ED10207-02","price":1120.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-ED102-Essential-Series-Air-Spaced-Triplet-APO-Refractor-Telescope-1_693ab91c-b145-478d-b502-9ec2339efaeb.jpg?v=1789060398"},{"product_id":"explore-scientific-ed80-fcd100-series-triplet-apo-refractor","title":"Explore Scientific ED80-FCD100 Series Triplet APO Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e80mm Aperture\u003c\/li\u003e\n\u003cli\u003e480mm Focal Length (f\/6)\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet with HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003e2.5\" HEX Focuser with 10 lb Load Capacity\u003c\/li\u003e\n\u003cli\u003eWeighs Only 7.5 lbs (3.4 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED80-FCD100 Series Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED80-FCD100 Series Triplet APO Refractor combines an 80mm aperture with a fast f\/6 focal ratio in an \u003ca href=\"\/collections\/optical-tubes\"\u003eoptical tube assembly\u003c\/a\u003e weighing just 7.5 lbs. Its 480mm focal length is ideal for wide-field imaging, while the air-spaced triplet objective featuring genuine HOYA FCD100 ED glass virtually eliminates chromatic aberration. A robust 2.5\" HEX focuser with a 10 lb load capacity provides a rigid imaging platform, for both portable visual observing and astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHOYA FCD100 Triplet Optics: Apochromatic Correction at f\/6\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED80 is an air-spaced triplet objective lens that uses one element of HOYA FCD100 glass. This extra-low dispersion material brings the red, green, and blue wavelengths of light to a single, sharp focal point, achieving true apochromatic color correction. This design prevents the distracting purple fringing seen around bright stars and planetary limbs in simpler \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, resulting in pure, high-contrast images with accurate color.\u003c\/p\u003e\n\u003cp\u003eThe telescope's f\/6 focal ratio provides a wide field of view and reduces exposure times for astrophotography compared to slower instruments. This combination of superior color correction and a fast optical speed makes the ED80-FCD100 a versatile instrument for capturing expansive targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5\" HEX Focuser: A Rigid Platform for 10 lb Imaging Payloads\u003c\/h3\u003e\n\u003cp\u003eDesigned for the demands of modern astrophotography, the ED80-FCD100 is equipped with a heavy-duty 2.5\" hexagonal focuser. It supports imaging setups up to 10 lbs (4.5 kg).\u003c\/p\u003e\n\u003cp\u003eThe focuser is rugged and provides precise control. Fine focusing matters most at focus for imaging, where small changes in drawtube position decide how sharp stars appear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 3.4 kg OTA with Vixen Dovetail and Hybrid Finder Base\u003c\/h3\u003e\n\u003cp\u003eWeighing only 7.5 lbs (3.4 kg) and measuring just 381 mm in its retracted configuration, the ED80-FCD100 is an exceptionally portable telescope. This low weight makes it an ideal \"grab-and-go\" instrument for quick backyard sessions and travels easily to dark-sky sites. It also means the telescope can be carried by a wide range of lighter, more portable \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e, reducing the overall weight of your setup.\u003c\/p\u003e\n\u003cp\u003eThe optical tube comes ready to mount with an integrated Vixen-style dovetail bar. Also included is an Explore Scientific Hybrid Finder Scope Base, which accepts both legacy Explore Scientific finder brackets and the common mini-dovetail format used by many other manufacturers, providing flexibility in your choice of finder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Light Path: EMD Coatings and a 99% Reflective 2\" Diagonal\u003c\/h3\u003e\n\u003cp\u003eTo ensure the maximum amount of light reaches your eye or camera sensor, the triplet objective uses Explore Scientific's proprietary EMD multi-layer coatings, which optimize light transmission. Multi-layer coatings reduce reflections, leading to brighter images and higher contrast, which is essential for observing faint details in nebulae and galaxies.\u003c\/p\u003e\n\u003cp\u003eFor visual observers, the package includes a 99% reflective 2\" diagonal, so very little light is lost on the way to the \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e. The diagonal also includes a 1.25\" adapter, allowing you to use eyepieces of both barrel sizes right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWide-Field Astrophotography at a 480mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe ED80-FCD100's 480mm focal length provides a generous field of view that is perfectly suited for many of the sky's most impressive deep-sky objects. This focal length allows you to frame large targets like the Pleiades star cluster (M45) in their entirety with a camera using an APS-C sensor.\u003c\/p\u003e\n\u003cp\u003eLike other refractors, the bare tube has some field curvature, which shows in the corners of larger sensors. Explore Scientific's 0.8x \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFocal Reducer\u003c\/a\u003e (ES-FR0.8x) is made for the FCD100-0806-02: the two-element reducer turns the 480 mm focal length into 384 mm and f\/6 into f\/4.8, has 55 mm (+\/- 2 mm) of back spacing and is threaded for a standard 42 mm \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e. Explore Scientific also sells this tube in packages with its Field Flattener for f\/5 to f\/7 refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFCD100 vs. FCD1: Why HOYA Glass Matters for Color Correction\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific offers refractors in both its FCD100 and Essential (FCD1) series. The primary difference is the grade of extra-low dispersion glass used. The ED80-FCD100 uses HOYA FCD100 glass, the apex of the FCD family, with performance equivalent to fluorite and color fidelity comparable to Ohara FPL-53. It nearly erases chromatic aberration.\u003c\/p\u003e\n\u003cp\u003eThe FCD100 Series improves upon Explore Scientific's original Essential Series air-spaced triplets, which use genuine HOYA FCD1 ED glass. Color correction matters most on bright targets such as the Moon, planets and bright stars, where residual false color is easiest to see.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Explore Scientific ED80-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an optical tube weight of only \u003cstrong\u003e7.5 lbs (3.4 kg)\u003c\/strong\u003e, the ED80-FCD100 is very forgiving on mount requirements. For visual use, a light-duty German equatorial mount or a robust \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth mount\u003c\/a\u003e will work well. For astrophotography, a stable equatorial mount with precise tracking is recommended to handle the weight of the telescope plus your camera and guiding equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED80-FCD100 a good telescope for viewing planets like Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The apochromatic triplet optics provide extremely high-contrast and color-pure images, which is ideal for planetary observing. On Jupiter, you can expect to resolve distinct cloud bands, the Great Red Spot, and its four Galilean moons. With Saturn, the Cassini Division in its rings will be clearly visible at medium to high magnification on nights of good seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for astrophotography with the ED80-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor cameras with smaller sensors, you may get acceptable results without one. However, to achieve perfectly round stars across the entire field of an APS-C sensor, a field flattener is recommended. Refractors show some field curvature, and a flattener corrects it toward the edges of the frame. Explore Scientific sells this tube in packages with its Field Flattener for f\/5 to f\/7 refractors, and lists its 0.8x Focal Reducer for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 80mm aperture of the ED80-FCD100 perform on deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 80mm aperture is excellent for wide-field views of large, bright deep-sky objects. Under dark skies, you can expect impressive views of targets like the Orion Nebula (M42), the Andromeda Galaxy (M31), and many open star clusters. While it won't have the light-gathering power of a larger telescope for resolving faint galaxies, its high-contrast optics provide a dark background that makes bright objects stand out beautifully.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the 2.5\" HEX focuser on the ED80-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2.5\" hexagonal focuser\u003c\/strong\u003e is built for imaging. It is rugged, provides precise control and supports imaging setups up to \u003cstrong\u003e10 lbs (4.5 kg)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces with this telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Explore Scientific ED80-FCD100 comes with a \u003cstrong\u003e99% reflective 2\" diagonal\u003c\/strong\u003e and a 1.25\" adapter. This allows you to use both 2\" and 1.25\" eyepieces, giving you access to the widest possible fields of view for observing large nebulae and star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED80-FCD100 a good choice for a travel scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. The optical tube weighs only \u003cstrong\u003e7.5 lbs (3.4 kg)\u003c\/strong\u003e and has a retracted length of just \u003cstrong\u003e381 mm\u003c\/strong\u003e, making it very compact and easy to transport. Its high-end optical performance means you don't have to sacrifice image quality for portability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the ED80-FCD100 and the Essential Series ED80?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key difference is the glass used in the triplet lens. The ED80-FCD100 uses premium \u003cstrong\u003eHOYA FCD100\u003c\/strong\u003e glass, which Explore Scientific compares with Ohara FPL-53 and with fluorite. The Essential Series uses genuine HOYA FCD1 ED glass, and Explore Scientific presents the FCD100 Series as an improvement upon it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ED80-FCD100 come with a finder scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA finder scope is not included. However, the telescope comes with a \u003cstrong\u003eHybrid Finder Scope Base (ES-FB2N1-00)\u003c\/strong\u003e installed. This base is compatible with a wide variety of finder scope brackets, including those from Explore Scientific and other brands using a mini-dovetail style foot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this telescope for terrestrial (daytime) viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need an erecting \u003ca href=\"\/collections\/diagonals\"\u003eprism diagonal\u003c\/a\u003e (sold separately) to get a correctly oriented image (upright and non-reversed). With an erecting prism the telescope can be used for daytime viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570176076\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e480mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003eAir-spaced triplet, HOYA FCD100 ED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e2.5\" HEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e381 mm (475 mm with dew shield)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e100.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e7.5 lbs (3.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eVixen-Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eApochromatic triplet refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eED80-FCD100 OTA with 2.5\" HEX focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e99% reflective 2\" diagonal with 1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base ES-FB2N1-00\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207371037,"sku":"ES-FCD100-0806-02","price":1254.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED80-FCD100-Series-Air-Spaced-Triplet-Refractor-FCD100-0806-01-FCD100-0806-01-1__55037.1594240386.1280.1280.jpg?v=1684339015"},{"product_id":"explore-scientific-ed102-fcd100-series-triplet-apo-refractor","title":"Explore Scientific ED102-FCD100 Series Triplet APO Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm (4\") Aperture\u003c\/li\u003e\n\u003cli\u003e714mm Focal Length (f\/7)\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromat with HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003e2.5\" Dual-Speed Hexagonal Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e10 lbs (4.5 kg) Focuser Capacity\u003c\/li\u003e\n\u003cli\u003e12 lbs (5.4 kg) Optical Tube Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED102-FCD100 Series Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED102-FCD100 Series Triplet \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eAPO Refractor\u003c\/a\u003e integrates a 102mm objective and 714mm focal length into a versatile f\/7 optical system for both imaging and visual work. Its air-spaced triplet objective uses a genuine HOYA FCD100 glass element to achieve exceptional chromatic aberration correction, all within an optical tube that weighs only 12 lbs. The robust 2.5\" dual-speed HEX focuser securely supports imaging payloads up to 10 lbs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTrue Apochromatic Optics: An FCD100 Air-Spaced Triplet\u003c\/h3\u003e\n\u003cp\u003eAt the core of the ED102-FCD100 is an advanced air-spaced triplet objective lens. This design utilizes a central element made from genuine HOYA FCD100, an extra-low dispersion (ED) glass with optical properties comparable to pure fluorite. Together with a high refractive index element, this triplet design achieves a true apochromatic level of performance, virtually eliminating the chromatic aberration (false color) that can compromise image contrast and sharpness in simpler designs.\u003c\/p\u003e\n\u003cp\u003eYou will see the difference on high-contrast targets. Bright stars like Vega resolve as sharp pinpoints without distracting purple halos, and the lunar limb appears crisp and well-defined against the blackness of space. The optics are diffraction-limited, with Explore Scientific's proprietary EMD enhanced multi-layer coatings on all optical surfaces, for brilliant, high-contrast views of the Moon, planets and deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Versatile f\/7 System: 102mm Aperture and 714mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe ED102-FCD100's optical specifications create a powerful and flexible instrument. The 102mm (4\") aperture gathers enough light to reveal faint details in galaxies and resolve globular clusters, while its diffraction-limited optics can deliver stunning planetary and lunar views. This aperture class represents a significant step up from smaller 80mm \u003ca href=\"\/collections\/refractors\"\u003erefractors\u003c\/a\u003e, providing a noticeable increase in brightness and resolution without a major penalty in size or weight.\u003c\/p\u003e\n\u003cp\u003eThe 714mm focal length results in an f\/7 focal ratio, a modern sweet spot for refractors. This ratio is fast enough for efficient deep-sky imaging while remaining forgiving of \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e designs and maintaining excellent visual contrast. It still provides the image scale needed to achieve high magnifications for resolving detail on Jupiter's cloud bands or the Cassini Division in Saturn's rings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5\" HEX Focuser: 10 lbs of Imaging-Grade Stability\u003c\/h3\u003e\n\u003cp\u003eThe ED102-FCD100 is equipped with a 2.5\" hexagonal rack-and-pinion focuser. The precision 2.5\" HEX focuser offers smooth, stable focusing and supports imaging setups up to 10 lbs (4.5 kg).\u003c\/p\u003e\n\u003cp\u003eFocusing is smooth and precise thanks to the dual-speed mechanism, which allows for coarse adjustments to find initial focus and micro-adjustments to achieve critical sharpness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptimized for Visual Observing with a 99% Reflective 2\" Diagonal\u003c\/h3\u003e\n\u003cp\u003eWhile built for imaging, the ED102-FCD100 is also a fine visual instrument. Included in the package is a 99% reflective 2\" diagonal. This ensures that the maximum amount of light from the objective reaches your eye, preserving the brightness and contrast of the image. The 2\" format allows you to use wide-field 2\" eyepieces to take full advantage of the telescope's ability to frame large star fields and nebulae.\u003c\/p\u003e\n\u003cp\u003eFor added flexibility, a 1.25\" adapter is included, making the telescope compatible with the vast range of standard 1.25\" eyepieces. This allows you to easily switch to higher-power planetary eyepieces or use specialized 1.25\" filters. The combination of the apochromatic optics and the high-quality diagonal delivers breathtaking views of everything from the Moon and planets to the most delicate deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAstrophotography with the ED102-FCD100\u003c\/h3\u003e\n\u003cp\u003eThe ED102-FCD100 is a formidable platform for astrophotography. Its f\/7 focal ratio and 714mm focal length are ideal for a wide range of celestial targets, from expansive emission nebulae to distant galaxy clusters. The apochromatic optics keep stars small and tight with virtually no violet bloating, resulting in images with excellent color fidelity and high resolution.\u003c\/p\u003e\n\u003cp\u003eLike other refractors, the bare tube has a curved focal plane, so sharp stars toward the corners of a larger sensor call for a corrector. Two correctors are available for the FCD100-10207-02: the 0.8x \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFocal Reducer\u003c\/a\u003e (ES-FR0.8x), which turns the 714 mm focal length into 571 mm and f\/7 into f\/5.6, with 55 mm (+\/- 2 mm) of back spacing and a thread for a standard 42 mm \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e; and the Field Flattener for f\/5 to f\/7 refractors (ES-FF2F5\/F7), which does not change the focal length, needs 55 mm (+\/-2 mm) of spacing to the sensor and is for photographic use only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED102 Triplet vs. Standard ED Doublet Refractors\u003c\/h3\u003e\n\u003cp\u003eWhile a quality ED doublet refractor provides a significant improvement over a basic \u003ca href=\"\/collections\/achromatic-refractors\"\u003eachromat\u003c\/a\u003e, it still exhibits a small but measurable amount of residual chromatic aberration. The Explore Scientific ED102-FCD100's triplet design is specifically engineered to correct this remaining false color for a tangible increase in performance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Astrophotography:\u003c\/strong\u003e The triplet's superior color correction produces smaller, more concentrated star images free from blue or violet bloat. This allows for more accurate color data acquisition, captures finer stellar detail,.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Visual Observing:\u003c\/strong\u003e When pushing magnification on bright targets like Jupiter, Venus, or the lunar limb, the triplet's near absence of color fringing delivers a sharper, higher-contrast image. This makes it easier to resolve subtle details, such as delicate festoons in Jupiter's atmosphere or tiny craterlets on the Moon's surface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for the Field: Tube, Dew Shield, and Mounting\u003c\/h3\u003e\n\u003cp\u003eThe ED102-FCD100 is built for practical use under the stars. A retractable \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew shield\u003c\/a\u003e extends to 774 mm to minimize moisture formation on the objective lens during long nights and to block off-axis light from degrading the image. When retracted, the tube length is a compact 603 mm for easy transport and storage.\u003c\/p\u003e\n\u003cp\u003eThe telescope attaches to any compatible mount via a standard Vixen-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. Also included is Explore Scientific's Hybrid Finder Scope Base, which is designed to accept a wide variety of finder scope brackets, including Explore Scientific's own and those using the common Vixen\/Synta-style mini-dovetail, giving you flexibility in your choice of aiming device.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 12 lb ED102 as a \"Grab-and-Go\" Instrument\u003c\/h3\u003e\n\u003cp\u003eWeighing in at just 12 lbs (5.4 kg), the ED102-FCD100 optical tube is remarkably portable for a 4\" apochromatic triplet. This light weight makes it an ideal \"grab-and-go\" telescope when paired with a medium-duty equatorial mount. It is easy to set up and transport to a dark sky site, yet it offers the optical power to make the trip worthwhile.\u003c\/p\u003e\n\u003cp\u003eThis portability also enhances its versatility. The ED102 can also serve as an auxiliary scope on larger instruments, for guiding and imaging versatility. Its combination of high-end optical performance and manageable weight makes it a valuable and flexible addition to any astronomer's equipment collection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the Explore Scientific ED102-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an optical tube weight of only 12 lbs, the ED102-FCD100 is quite versatile. For visual use, choose a stable equatorial mount rated well above the tube's weight. For astrophotography, add the weight of your camera and accessories and choose a mount whose imaging capacity comfortably exceeds the total.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD100 glass in the ED102 refractor improve my views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 is an extremely high-quality extra-low dispersion (ED) glass with optical properties comparable to Ohara FPL-53 and fluorite. When used in a triplet lens design like the ED102's, it allows for exceptional correction of chromatic aberration (false color). This results in high-contrast images with virtually no color fringing around bright objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the 2.5\" HEX focuser on the ED102-FCD100 handle a heavy camera and filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2.5\" hexagonal rack-and-pinion focuser is specifically designed for imaging. It supports imaging setups up to 10 lbs (4.5 kg). Add up the weight of your camera and accessories and stay within that figure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Explore Scientific ED102's triplet design over a doublet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe air-spaced triplet objective in the ED102-FCD100 provides a higher level of color correction than standard ED doublets. This third lens element, working with the HOYA FCD100 glass, virtually eliminates the residual chromatic aberration that doublets can exhibit. For imagers, this means smaller, tighter stars. For visual observers, it means higher contrast on planetary and lunar details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for imaging with the ED102-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor serious astrophotography, especially with cameras that have APS-C or larger sensors, a field flattener or focal reducer\/flattener is highly recommended. This accessory corrects the field curvature of the objective so stars stay sharp toward the edges, not just in the center. Suitable correctors for this tube are the Explore Scientific 0.8x Focal Reducer (571 mm, f\/5.6) and Field Flattener for f\/5 to f\/7 refractors. For visual use or with small-sensor \u003ca href=\"\/collections\/planetary-cameras\"\u003eplanetary cameras\u003c\/a\u003e, a flattener is not necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED102-FCD100 perform on planetary targets like Jupiter from the city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ED102-FCD100 is an excellent planetary telescope, even from light-polluted areas. Its apochromatic optics deliver a high-contrast image, and the Moon and planets are bright enough to observe well from the city. The 714mm focal length provides ample magnification for resolving Jupiter's main cloud belts, the Great Red Spot, and the shadows of its Galilean moons with a standard eyepiece or \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lens\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the f\/7 focal ratio of the ED102 good for imaging large nebulae like the Veil Nebula (NGC 6960)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe f\/7 focal ratio is a versatile sweet spot. It is fast enough to capture significant signal on emission nebulae in a reasonable time, while the 714mm focal length frames individual sections of large targets like the Veil Nebula. For a wider field, Explore Scientific's 0.8x Focal Reducer turns this tube into a 571 mm, f\/5.6 system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow portable is the ED102-FCD100 for field trips to dark sky sites?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a tube weight of only 12 lbs and a retracted length of 603 mm, the ED102-FCD100 is very portable. It qualifies as a \"grab-and-go\" scope when paired with a suitable mid-sized mount, making it an excellent choice for traveling to dark sky locations without sacrificing high-end optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my 1.25\" eyepieces with the ED102-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The telescope comes with a high-quality 2\" diagonal that includes a 1.25\" adapter. This allows you to use both 2\" wide-field eyepieces and standard 1.25\" eyepieces, giving you complete flexibility to choose the best magnification and field of view for your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the included Hybrid Finder Scope Base?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included Hybrid Finder Scope Base (ES-FB2N1-00) is a versatile mounting bracket. It is designed to accept both legacy Explore Scientific finder scope brackets and the more common Vixen\/Synta-style mini-dovetail brackets. This gives you a wide choice of compatible finder scopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm (4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e714mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Dual-Speed Hexagonal Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Capacity\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e12 lbs (5.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017614\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e603 mm (774 mm with dew shield)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e119 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eVixen-Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eED102-FCD100 OTA with 2.5\" HEX focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e99% reflective 2\" diagonal with 1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base ES-FB2N1-00\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207436573,"sku":"ES-FCD100-10207-02","price":1904.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED102-FCD100-Series-Air-Spaced-Triplet-Refractor-Telescope-FCD100-10207-01-FCD100-10207-01-1__31373.1594240388.1280.1280.jpg?v=1684339028"},{"product_id":"explore-scientific-ed102-fcd100-series-triplet-telescope-carbon-fiber","title":"Explore Scientific ED102-FCD100 Series Triplet Telescope - Carbon Fiber","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm (4\") Aperture\u003c\/li\u003e\n\u003cli\u003e714mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromat with HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003e2.5\" HEX Focuser\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eExplore Scientific ED102-FCD100 Series Triplet Telescope - Carbon Fiber\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific ED102-FCD100 Carbon Fiber telescope integrates a 102mm (4\") apochromatic triplet objective and a 714mm focal length into a lightweight carbon fiber tube for imaging and visual observation. Its f\/7 focal ratio balances a wide field of view with the image scale needed for detailed targets, while the air-spaced optical design featuring HOYA FCD100 glass delivers images with virtually no chromatic aberration. The optical tube is equipped with a robust 2.5\" HEX \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e capable of supporting heavy imaging gear.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 102mm FCD100 Air-Spaced Triplet Objective\u003c\/h3\u003e\n      \u003cp\u003eAt the core of the ED102-FCD100 is a 102mm air-spaced triplet objective, an optical design that uses three lenses to bring the colors of the visible spectrum to a common focus. This apochromatic configuration minimizes chromatic aberration, the false color halos that can appear around bright stars and planetary limbs in simpler \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e designs.\u003c\/p\u003e\n      \u003cp\u003eThe system's color correction is elevated by the inclusion of a genuine HOYA FCD100 glass element. This premium Extra-low Dispersion (ED) glass features optical characteristics nearly equivalent to pure fluorite, allowing it to precisely control the path of blue and violet light. For the observer, this results in several key benefits:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePinpoint Stars:\u003c\/strong\u003e Stars resolve as sharp, tight points of light against a black background, without distracting purple or blue fringing.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Contrast:\u003c\/strong\u003e By eliminating unfocused violet light that can reduce image clarity, subtle details on planetary surfaces and faint structures within nebulae become more apparent.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTrue Color Fidelity:\u003c\/strong\u003e The apochromatic design ensures that the natural colors of stars and deep-sky objects are rendered accurately, which is critical for both scientific imaging and aesthetic astrophotography.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA 714mm Focal Length at f\/7: Field of View and Image Scale\u003c\/h3\u003e\n      \u003cp\u003eThe ED102-FCD100's optical system features a 714mm focal length, yielding a native focal ratio of f\/7. This combination is often considered a \"sweet spot\" for all-around astronomical use, offering a versatile balance between wide-field views and the magnification required for smaller targets. It provides enough image scale to resolve details on Jupiter and Saturn, while a low-power \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e still shows wide star fields.\u003c\/p\u003e\n      \u003cp\u003eFor imagers, the 714mm focal length gives a moderate image scale. Work out your own sampling from your camera's pixel size: image scale in arcseconds per pixel is 206.3 times the pixel size in microns divided by the focal length in millimeters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 2.5\" HEX Focuser for Heavy Imaging Payloads\u003c\/h3\u003e\n      \u003cp\u003eThe ED102-FCD100 is equipped with a 2.5\" HEX focuser, which is robust and capable of supporting heavy imaging gear. A large focuser leaves room for 2\" accessories and camera adapters at the back of the telescope.\u003c\/p\u003e\n      \u003cp\u003eThe focuser is rated for up to 10 lbs of imaging accessories.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCarbon Fiber Construction: Thermal Stability and Reduced Weight\u003c\/h3\u003e\n      \u003cp\u003eThe optical tube of this ED102-FCD100 is constructed from carbon fiber. The carbon fiber construction significantly reduces weight without sacrificing rigidity, making the telescope easier to handle and improving performance on any mount.\u003c\/p\u003e\n      \u003cp\u003eThe lower mass makes the telescope easier to transport, set up, and balance on a mount. It also means the telescope can achieve excellent stability on a wider range of mid-sized \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eED102 FCD100 Triplet vs. a 102mm ED Doublet: The Value of True Apo Correction\u003c\/h3\u003e\n      \u003cp\u003eWhile a high-quality 102mm ED doublet refractor is a very capable instrument, the triplet design of the ED102-FCD100 aims at a higher level of color correction. A doublet brings two colors to a common focus and can leave some blue-violet error; a third element gives the designer more freedom to correct it. The ED102-FCD100 delivers virtually no chromatic aberration.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eVisual Difference:\u003c\/strong\u003e On a bright star like Vega or Sirius, a doublet may still show a faint violet halo at high magnification. With virtually no chromatic aberration, the ED102-FCD100 keeps such stars clean and helps on planets and double stars at high power.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eImaging Advantage:\u003c\/strong\u003e For astrophotography, the superior color correction prevents the \"blue bloat\" that can make stars appear oversized and soft in images from less-corrected scopes. This results in sharper, more natural-looking astrophotos with higher overall contrast.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eVisual and Astrophotography Applications with the ED102-FCD100\u003c\/h3\u003e\n      \u003cp\u003eExplore Scientific designed the ED102-FCD100 Carbon Fiber for both astrophotographers and visual observers.\u003c\/p\u003e\n      \u003cp\u003eFor the visual observer, the 102mm aperture gathers enough light to provide stunning views of deep-sky objects from a dark-sky site. Globular clusters like the Hercules Cluster (M13) are resolved into swarms of individual stars, and the delicate structures of the Orion Nebula (M42) are revealed with impressive contrast. On the planets, the lack of chromatic aberration allows you to push magnification on nights of steady seeing to observe details like Jupiter's cloud bands and Saturn's Cassini Division.\u003c\/p\u003e\n      \u003cp\u003eFor the astrophotographer, the 714mm focal length suits a wide variety of nebulae, galaxies and star clusters. A corrector is recommended for sharp stars toward the corners of larger camera sensors: the Explore Scientific 0.8x \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eFocal Reducer\u003c\/a\u003e (ES-FR0.8x) suits the FCD100-10207-CF-01, turning 714 mm into 571 mm and f\/7 into f\/5.6, with 55 mm (+\/- 2 mm) of back spacing and a thread for a standard 42 mm \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the main advantages of the Explore Scientific ED102-FCD100's carbon fiber tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe carbon fiber tube offers two key benefits over aluminum. First, it is \u003cstrong\u003esignificantly lighter\u003c\/strong\u003e, making the telescope easier to handle and placing less strain on your mount. Second, it does this \u003cstrong\u003ewithout sacrificing rigidity\u003c\/strong\u003e, improving performance on any mount.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD100 glass in the ED102 triplet improve my images?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eHOYA FCD100 is a premium Extra-low Dispersion (ED) glass with optical properties similar to fluorite. In the ED102's triplet lens design, it is the key element in \u003cstrong\u003evirtually eliminating chromatic aberration\u003c\/strong\u003e (false color). This results in razor-sharp stars, higher contrast, and true-to-life colors, which is essential for both high-resolution imaging and critical visual observation.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2.5\" HEX focuser on the ED102-FCD100 suitable for a full astrophotography setup?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e2.5\" HEX focuser\u003c\/strong\u003e is robust and capable of supporting heavy imaging gear. It is rated for up to 10 lbs of imaging accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific ED102-FCD100 perform on a bright target like the Orion Nebula (M42)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe ED102-FCD100 will provide exceptional views of the Orion Nebula (M42). Its apochromatic optics will render the stars of the Trapezium cluster as distinct points of light with virtually no color fringing. You will be able to resolve the delicate structures and wisps of nebulosity with high contrast against a dark sky background, making it an ideal instrument for both viewing and imaging this deep-sky showpiece.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ED102-FCD100 for high-magnification planetary viewing of Jupiter or Saturn?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the ED102-FCD100 is an excellent planetary telescope. Its freedom from chromatic aberration allows you to push the magnification high on nights of good seeing. You can expect to see fine details like the cloud bands and Great Red Spot on Jupiter, and the Cassini Division in Saturn's rings, with crisp, high-contrast views.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is recommended for the Explore Scientific ED102-FCD100?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor visual use, a sturdy \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth mount\u003c\/a\u003e would be sufficient. For astrophotography, a stable German Equatorial Mount (GEM) with GoTo capability is strongly recommended to handle the telescope and associated imaging gear. The carbon fiber tube reduces the weight, making it compatible with a wide range of mid-sized mounts, but choosing a mount with ample payload capacity will ensure stable, long-exposure imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for astrophotography with the ED102-FCD100?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor serious astrophotography, especially with cameras that have APS-C or larger sensors, a corrector is recommended. A corrector keeps stars round toward the corners of the frame; the Explore Scientific 0.8x Focal Reducer (571 mm, f\/5.6) suits this carbon fiber tube.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the f\/7 focal ratio of the ED102-FCD100 a good choice?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe f\/7 focal ratio is a versatile middle ground. It's fast enough to capture faint details in nebulae without requiring extremely long exposure times, yet gives enough image scale for planetary detail. It offers a great balance for imagers and visual observers who want to observe a wide variety of celestial objects.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific ED102-FCD100 considered a \"grab-and-go\" telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt is a lightweight powerhouse, and spontaneous grab-and-go visual sessions are one of its uses. It still needs a solid mount, but the carbon fiber tube makes it easier to carry and set up.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm (4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e714mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003eAir-spaced triplet, HOYA FCD100 ED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e2.5\" HEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExplore Scientific ED102-FCD100 Series Triplet Telescope - Carbon Fiber\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207469341,"sku":"ES-FCD100-10207-CF-01","price":2128.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED102-FCD100-Series-Air-Spaced-Triplet-Telescope-in-Carbon-Fiber-FCD100_25E2_2580_259310207-CF-FCD100-10207-CF-1__24574.1594240388.1280.1280.jpg?v=1684339033"},{"product_id":"explore-scientific-ar102-doublet-refractor","title":"Explore Scientific AR102 Doublet Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm (4-inch) Aperture\u003c\/li\u003e\n\u003cli\u003ef\/6.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e11.5 lbs Optical Tube Weight\u003c\/li\u003e\n\u003cli\u003eTwo-Speed 2\" Crayford Focuser\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" Dielectric Diagonal \u0026amp; 8x50 Finderscope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific AR102 Doublet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific AR102 Doublet Refractor combines a 102mm air-spaced doublet objective with a fast f\/6.5 focal ratio to deliver bright, high-contrast images of the Moon, planets, and deep-sky objects. Weighing just 11.5 lbs, this optical tube assembly is exceptionally portable and comes equipped with a 2-inch two-speed Crayford focuser, a 2-inch dielectric diagonal, and an 8x50 finderscope for a complete observing package right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 102mm f\/6.5 Air-Spaced Doublet\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the AR102 is a classic crown-and-flint air-spaced doublet lens. This design provides sharp, contrasty views that make it an excellent choice for detailed lunar observation, resolving the cloud belts of Jupiter, or framing bright star clusters like the Pleiades (M45). Its f\/6.5 focal ratio offers a wide field of view, ideal for sweeping the Milky Way.\u003c\/p\u003e\n\u003cp\u003eAs an \u003ca href=\"\/collections\/achromatic-refractors\"\u003eachromatic refractor\u003c\/a\u003e, the AR102 will exhibit some minor chromatic aberration, or false color, on the brightest objects like Venus and Sirius. This is an expected optical trade-off for the design, which prioritizes portability and affordability over the color correction of a more expensive apochromatic system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Ready-to-Image Platform: 2-Speed Focuser and 2\" Diagonal\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific includes professional-grade components that elevate the AR102's usability. The precision two-speed 2\" Crayford focuser allows for smooth, exact focus adjustments, which are critical for capturing sharp planetary images. The included 2\" dielectric-coated diagonal maximizes light transmission and enables the use of wide-field 2\" \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e for immersive views.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8x50 Finderscope:\u003c\/strong\u003e The large aperture straight-through \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e makes locating faint targets significantly easier than with smaller red-dot finders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick-Release Base:\u003c\/strong\u003e The finder mounts to a hybrid quick-release base for fast setup and breakdown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVixen-Style Dovetail:\u003c\/strong\u003e A sturdy cradle ring with a standard Vixen-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail plate\u003c\/a\u003e ensures compatibility with a vast range of popular astronomical mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGrab-and-Go Astronomy at 11.5 lbs\u003c\/h3\u003e\n\u003cp\u003eWith an optical tube weight of only 11.5 lbs, the AR102 is a truly portable instrument. It's light enough to be managed easily by one person and pairs well with medium-duty \u003ca href=\"\/collections\/alt-azimuth-mounts\"\u003ealt-azimuth\u003c\/a\u003e or \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e, creating a setup that can be moved and assembled in minutes. This portability makes it an ideal telescope for educational outreach, public star parties, or simply taking to a dark-sky site on a moment's notice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eExplore Scientific AR102 vs. Standard 4-inch Achromats\u003c\/h3\u003e\n\u003cp\u003eWhile many 4-inch achromatic refractors offer similar optical views, the AR102 distinguishes itself with its standard accessories. Competing telescopes in this class often ship with a basic single-speed focuser and a 1.25\" diagonal, requiring immediate upgrades for serious observing or imaging.\u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific AR102, by contrast, includes a two-speed focuser and a 2\" dielectric diagonal from the start. These features provide a superior out-of-the-box experience, saving you the expense and effort of sourcing these critical components separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is best for the Explore Scientific AR102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its light weight of \u003cstrong\u003e11.5 lbs\u003c\/strong\u003e, the AR102 is well-supported by a variety of mounts. For visual use, a medium-duty alt-azimuth mount like the Explore Scientific Twilight I or a Vixen Porta Mount II will provide a stable, intuitive grab-and-go setup. For astrophotography, a German equatorial mount with a payload capacity of at least 20 lbs, such as a Celestron AVX or \u003ca href=\"\/products\/sky-watcher-heq5-mount\"\u003eSky-Watcher HEQ5\u003c\/a\u003e, is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see color fringing (chromatic aberration) with the AR102 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, as an achromatic refractor, the AR102 will show a slight purple or violet halo around the brightest stars and planetary limbs. This is a characteristic of the two-element lens design. While it is noticeable on targets like Vega or Jupiter, it is generally well-controlled and does not significantly impact views of fainter deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific AR102 perform on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe AR102 provides excellent views of the Orion Nebula (M42). Its \u003cstrong\u003e102mm aperture\u003c\/strong\u003e gathers enough light to reveal the intricate structures of the nebula's gas clouds, and the f\/6.5 focal ratio allows you to frame the entire object in a single field of view with a low-power, wide-field eyepiece. You will be able to easily resolve the four primary stars of the Trapezium cluster at its core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the AR102 a good telescope for viewing Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The AR102's high-contrast optics are well-suited for planetary viewing. With a good quality high-power eyepiece, you will be able to clearly see Jupiter's main cloud belts and its four Galilean moons. On Saturn, the rings are sharply defined, and you can often spot the Cassini Division on nights of steady seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch eyepieces with the Explore Scientific AR102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The AR102 comes standard with a \u003cstrong\u003e2-inch focuser\u003c\/strong\u003e and a \u003cstrong\u003e2-inch diagonal\u003c\/strong\u003e, allowing you to take full advantage of wide-field 2-inch eyepieces. This is a significant advantage for observing large deep-sky objects and star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to start astrophotography with the Explore Scientific AR102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo begin imaging with the AR102, you will need a sturdy German equatorial mount for tracking, a camera (DSLR or dedicated \u003ca href=\"\/collections\/cameras\"\u003eastronomy camera\u003c\/a\u003e), and a \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e and T-adapter to connect the camera to the telescope's focuser. For improved results, a \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efield flattener\u003c\/a\u003e is recommended to correct for field curvature inherent in fast refractors, and an autoguiding system will enable longer, sharper exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Crown-and-Flint Doublet Achromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e663mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Two-Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Dielectric, 99% Reflectivity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003e8x50 Straight-Through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eCradle Rings with Vixen-Style Dovetail Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e11.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010080\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e648 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e100.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAR102 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Two-Speed Crayford Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Dielectric Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8x50 Straight-Through Finderscope with Bracket\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCradle Ring Assembly with Vixen-Style Dovetail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207698717,"sku":"ES-DAR102065-02","price":504.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-AR102-Air-Spaced-Doublet-Refractor-DAR102065-01-DAR102065-01-1__23671.1594240392.1280.1280.jpg?v=1684338864"},{"product_id":"explore-scientific-ed80-essential-series-triplet-apo-refractor","title":"Explore Scientific ED80 Essential Series Air-Spaced Triplet Refractor Telescope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e80mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/6 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eHOYA FCD1 Extra-Low Dispersion Glass\u003c\/li\u003e\n\u003cli\u003e2\" Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eED80 Essential Series Air-Spaced Triplet Refractor Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED80 Essential Series refractor delivers true apochromatic views by combining an 80mm objective with a fast f\/6 focal ratio in an air-spaced triplet optical design. Featuring premium HOYA FCD1 extra-low dispersion glass and a robust 2\" rack-and-pinion focuser, this telescope produces diffraction-limited, high-contrast images with virtually no chromatic aberration, making it a definitive choice for portable visual astronomy and wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 80mm f\/6 Triplet Apochromatic Heart\u003c\/h3\u003e\n\u003cp\u003eAt the core of the ED80 is a three-lens objective featuring genuine HOYA FCD1 ED glass. This triplet design achieves a superior level of color correction compared to standard doublet refractors, eliminating distracting purple fringing around bright stars and planetary limbs. Combined with proprietary EMD multi-layer coatings, the optics maximize light transmission and contrast, revealing subtle details in the rugged lunar terrain and the brightest Messier objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 2\" Focuser and Finder Base\u003c\/h3\u003e\n\u003cp\u003eThe ED80 is equipped with a solid 2\" rack-and-pinion focuser capable of supporting typical imaging payloads without flexure. Included extension tubes ensure you can achieve focus with a wide range of accessories, from a 2\" diagonal for visual use to a DSLR or dedicated astronomy camera for imaging. A pre-installed Hybrid Finder Scope Base provides a secure mounting point for most Vixen-style finderscopes and red dot finders, streamlining your setup process.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA \"Grab-and-Go\" Scope for Visual and Imaging\u003c\/h3\u003e\n\u003cp\u003eWith its compact optical tube and lightweight construction, the ED80 excels as a portable instrument. It's small enough for spontaneous backyard sessions but optically powerful enough to serve as a high-end guide scope or a primary wide-field imaging refractor. The f\/6 focal ratio provides expansive views of star clusters like the Pleiades (M45) and large nebulae like the North American Nebula (NGC 7000), framing them beautifully in a single field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED80 Triplet vs. Standard ED Doublet Refractors\u003c\/h3\u003e\n\u003cp\u003eWhile a standard two-lens ED doublet refractor is often lighter and more affordable, it cannot match the color fidelity of a true apochromatic triplet like the ED80. The third lens element in the ED80 provides a more advanced correction of the visual spectrum, resulting in several key advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstrophotography:\u003c\/strong\u003e The ED80's superior color correction produces clean, tight stars with pure white cores and no blue or violet bloat, reducing post-processing time and yielding more natural-looking images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary Viewing:\u003c\/strong\u003e At high magnification, the absence of chromatic aberration means you see only the true detail and color of targets like Jupiter's Great Red Spot and Saturn's rings, without a soft halo of unfocused light smearing the view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Contrast:\u003c\/strong\u003e By bringing all wavelengths of light to the same focal point, the ED80 delivers a darker sky background and sharper, higher-contrast images across the board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Explore Scientific ED80 an \"apochromat\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific ED80 is considered a true apochromat (APO) because its \u003cstrong\u003eair-spaced triplet objective lens\u003c\/strong\u003e, which includes a central element made of \u003cstrong\u003eHOYA FCD1 ED glass\u003c\/strong\u003e, is designed to bring three wavelengths of light (red, green, and blue) to the same focal point. This virtually eliminates chromatic aberration, or false color, resulting in sharp, high-contrast images with pure color rendition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED80 suitable for a beginner in astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the ED80 is an excellent starting point for wide-field astrophotography. Its f\/6 focal ratio is relatively fast, reducing exposure times, and its apochromatic optics provide clean star images that are easier to process. While a field flattener is recommended for perfectly sharp stars to the edge of the frame, the scope's inherent optical quality provides a strong foundation for learning deep-sky imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED80 perform on planets like Jupiter from a light-polluted location?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ED80's high-contrast, color-free optics make it a capable planetary performer, even from the suburbs. Since planets are bright, light pollution is not a major factor. The diffraction-limited optics will allow you to clearly resolve Jupiter's main cloud bands, its four Galilean moons, and Saturn's rings, provided you have good atmospheric seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat essential accessories do I need to start observing with the ED80?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo use the Explore Scientific ED80 for visual observing, you will need a few key items not included with the optical tube: a stable astronomical mount (like an EQM-35 or CEM26), a 1.25\" or 2\" star diagonal, and at least one or two eyepieces. A finder scope or red-dot finder is also highly recommended for locating objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ED80 telescope for terrestrial (daytime) viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the ED80 works exceptionally well for daytime viewing of landscapes, wildlife, or ships at sea. You will need an \"image-erecting\" diagonal (either a 45° or 90° model) to flip the image so it appears correctly oriented. Its apochromatic optics will provide stunningly sharp and color-accurate views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is recommended for the Explore Scientific ED80?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, a light-duty German equatorial mount like the Sky-Watcher EQM-35 or a robust alt-azimuth mount like the Explore Scientific Twilight I would be sufficient. For astrophotography, a more stable equatorial mount with GoTo capability, such as the Celestron AVX or iOptron CEM26, is recommended to handle the additional weight of a camera and guide scope and to provide accurate tracking for long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD1 ED Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" Rack-and-Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803034358\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eED80 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Rack-and-Pinion Focuser (Installed)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExtension Tubes for Focuser (Included)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base (Installed)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207797021,"sku":"ES-ED0806-02","price":784.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-ED80-Essential-Series-Air-Spaced-Triplet-Refractor-Telescope-1_25fbed13-7d0c-4e1b-a7d7-d3211d6b2854.jpg?v=1789060414"},{"product_id":"explore-scientific-fcd100-series-127mm-f-7-5-triplet-apo-refractor-aluminum-with-2-5-hex-focuser","title":"Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Aluminum with 2.5\" HEX Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm (5\") Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7.5 Focal Ratio \/ 952mm Focal Length\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eHOYA FCD100 ED Glass Element\u003c\/li\u003e\n\u003cli\u003e2.5\" Hexagonal Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e10 lbs (4.5 kg) Focuser Load Capacity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Aluminum with 2.5\" HEX Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FCD100 Series 127mm f\/7.5 Triplet \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eAPO Refractor\u003c\/a\u003e combines a large, diffraction-limited objective with premium HOYA FCD100 ED glass to deliver razor-sharp, high-contrast images. Its 952mm focal length provides a versatile balance for both planetary and deep-sky work, while the robust 2.5\" HEX focuser supports imaging payloads up to 10 lbs (4.5 kg). With an air-spaced triplet optical design housed in a 130mm diameter aluminum tube, this \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e is designed for serious visual observers and astrophotographers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFCD100 Triplet Optics: A 127mm Apochromatic Objective\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this refractor is a 127mm (5\") air-spaced triplet objective featuring a genuine HOYA FCD100 glass element. This extra-low dispersion (ED) material provides color correction equivalent to fluorite, virtually eliminating chromatic aberration. The result is images with virtually no false color or purple fringing around bright stars, planetary limbs and the lunar terminator.\u003c\/p\u003e\n\u003cp\u003eExplore Scientific combines the FCD100 glass with its proprietary EMD enhanced multi-layer coatings and describes the optics as diffraction-limited, for razor-sharp, high-contrast views of the Moon, planets and deep-sky objects, including delicate nebular structure and pinpoint star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe f\/7.5 Advantage: 952mm Focal Length for Planets and Deep Sky\u003c\/h3\u003e\n\u003cp\u003eThe telescope's 952mm focal length and f\/7.5 focal ratio create a highly versatile instrument. This combination offers enough magnification for resolving fine details on Jupiter's cloud bands and the Cassini Division in Saturn's rings, without making the instrument too specialized for wider-field targets. The 127mm aperture gathers enough light to make faint deep-sky objects pop, providing bright views of globular clusters and planetary nebulae.\u003c\/p\u003e\n\u003cp\u003eFor visual observers, this focal ratio works well with a wide range of \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e, from low-power 2-inch eyepieces for sweeping the Milky Way to high-power planetary eyepieces for detailed solar system work. For imagers, f\/7.5 is a solid starting point that can be adapted with optional \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efocal reducers\u003c\/a\u003e to capture larger targets or with \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow lenses\u003c\/a\u003e to increase the image scale for planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5\" HEX Focuser: A Rigid Platform for a 10 lb Imaging Train\u003c\/h3\u003e\n\u003cp\u003eA focuser for astrophotography has to carry the camera and its accessories. This refractor is equipped with a 2.5\" hexagonal rack-and-pinion focuser, which is robust, offering smooth, precise adjustments.\u003c\/p\u003e\n\u003cp\u003eIt can support heavy imaging setups up to 10 lbs (4.5 kg). The smooth, precise motion helps with the fine focus adjustments that planetary and deep-sky imaging need.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready Ergonomics: Aluminum Tube and Integrated Dew Shield\u003c\/h3\u003e\n\u003cp\u003eThe aluminum optical tube is engineered for both durability and practical use in the field. Measuring 849mm with the dew shield retracted, the telescope is manageable for transport and setup. Several integrated features minimize setup time and improve your observing sessions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield:\u003c\/strong\u003e An integrated dew shield extends to 1060mm, preventing moisture from forming on the objective lens during long nights and blocking stray light from nearby sources that could degrade image contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCradle Ring \u0026amp; Handle:\u003c\/strong\u003e The included cradle ring assembly provides a secure mounting point and features a top-mounted handle, making the optical tube easy to carry, lift, and mount onto your \u003ca href=\"\/collections\/saddles-and-clamps\"\u003edovetail saddle\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder Scope Base:\u003c\/strong\u003e A Hybrid Finder Scope Base is included, designed to accept both legacy Explore Scientific finders and standard Vixen-style finder scope brackets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVixen-Style Dovetail and Cradle for Easy Mounting\u003c\/h3\u003e\n\u003cp\u003eThe telescope comes ready to attach to a wide range of \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e thanks to the included Vixen-style (V-style) dovetail plate. This universal mounting standard ensures out-of-the-box compatibility with many of the most popular mounts used by amateur astronomers. The dovetail attaches securely to the base of the cradle ring assembly, providing a stable connection to your mount head.\u003c\/p\u003e\n\u003cp\u003eThe cradle ring with its carry handle and the Vixen-style dovetail plate come with the telescope, so you can get it onto your mount and start observing quickly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 99% Reflective 2\" Diagonal for High-Contrast Views\u003c\/h3\u003e\n\u003cp\u003eFor visual observers, the quality of the \u003ca href=\"\/collections\/diagonals\"\u003estar diagonal\u003c\/a\u003e is just as important as the main objective. Explore Scientific includes a 99% reflective 2\" diagonal. This ensures that the maximum amount of light from the objective reaches your eyepiece, resulting in brighter images and improved contrast. The diagonal provides a comfortable 90-degree viewing angle and includes a 1.25\" adapter, allowing you to use both 2\" and 1.25\" eyepieces and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHOYA FCD100 vs. FPL-53: Understanding Apochromatic Glass\u003c\/h3\u003e\n\u003cp\u003eIn the world of premium apochromatic refractors, two glass types are renowned for their exceptional color correction: Ohara FPL-53 and HOYA FCD100. Both are extra-low dispersion glasses that let optical designers bring the colors of the visible spectrum close to a common focus. Choosing between them is less about one being universally superior and more about the specific optical design it enables and the skill of the optician.\u003c\/p\u003e\n\u003cp\u003eHOYA FCD100 is the apex of the FCD family, with performance equivalent to fluorite, and the triplet virtually eliminates chromatic aberration. For an observer or imager, that means razor-sharp, high-contrast views without the false color that softens details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific FCD100 127mm APO perform on planets like Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis refractor excels at revealing fine planetary detail. The 127mm aperture resolves fine details, while the apochromatic FCD100 optics give high contrast with virtually no false color. You can expect to clearly see Jupiter's main cloud bands, the Great Red Spot, and the Cassini Division in Saturn's rings under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 127mm Triplet suitable for imaging a large nebula like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will likely need a focal reducer. At its native 952mm focal length (f\/7.5), the telescope is well-suited for smaller nebulae and galaxies. To fit very large objects like the North American Nebula or the Andromeda Galaxy (M31) into a single frame, adding an optional focal reducer\/flattener is recommended to widen the field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific FCD100 127mm APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optical tube's weight and length require a stable mount. For visual use, a medium-duty equatorial mount is sufficient. For astrophotography with a full imaging train, choose a more robust mount whose imaging capacity comfortably exceeds the total weight of the telescope and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 2.5\" HEX focuser on the FCD100 127mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2.5\" HEX focuser uses a hexagonal drawtube and a rack-and-pinion mechanism. It is robust, with smooth, precise adjustments, and can support heavy imaging setups up to 10 lbs (4.5 kg).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does HOYA FCD100 glass compare to FPL-53 in this refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 and Ohara FPL-53 are considered functional equivalents in their ability to correct for chromatic aberration. Both are premier ED glass types that, when used in a triplet objective lens design, produce a true apochromatic image with virtually no color fringing. Explore Scientific compares FCD100 with Ohara FPL-53 and with fluorite.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces and accessories with the Explore Scientific 127mm FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The telescope includes a 99% reflective 2\" diagonal, which takes 2\" eyepieces. A 1.25\" adapter is also included with the diagonal for use with smaller format eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific FCD100 127mm need a field flattener for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLike other refractors, it has some field curvature, so round stars toward the corners of a larger sensor call for a field flattener or reducer\/flattener. Stars in the center are sharp without one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the first thing I should do when setting up the FCD100 127mm for the first time?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, securely mount the optical tube to your equatorial mount using the Vixen-style dovetail. Once outside, let the telescope adjust to the outdoor temperature before observing at high power. Then insert the 2\" diagonal and a low-power eyepiece to align your finder scope during the daytime on a distant, stationary object like a treetop or telephone pole.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the carrying handle on the FCD100 127mm strong enough to lift the telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExplore Scientific supplies the cradle ring with a carry handle, meant for carrying the optical tube and lifting it onto and off the mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is a Hybrid Finder Scope Base?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included Hybrid Finder Scope Base is designed by Explore Scientific to be versatile. It accepts both their own legacy finder scope brackets and the more common mini-dovetail type brackets used by brands like Vixen, Synta, and Celestron, giving you flexibility in choosing a finder scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Hexagonal Rack-and-Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017621\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e952mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e849 mm (1060 mm with dew shield)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eVixen-Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFCD100 127mm OTA with 2.5\" HEX focuser and integrated dew shield\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCradle ring with carry handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVixen-style dovetail plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e99% reflective 2\" diagonal with 1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base ES-FB2N1-00\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207829789,"sku":"ES-FCD100-127075-02","price":3499.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FCD100-Series-127mm-f-7-5-Aluminum-Air-Spaced-Triplet-ED-APO-Refractor-with-2-5-inch-HEX-Focuser-FCD100-127075-01-1__30104.1594240394.1280.1280.jpg?v=1684338887"},{"product_id":"explore-scientific-fcd100-series-127mm-f-7-5-triplet-apo-refractor-carbon-fiber-with-2-5-hex-focuser","title":"Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Carbon Fiber with 2.5\" HEX Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm (5\") Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7.5 Focal Ratio \u0026amp; 952mm Focal Length\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromat with HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube Weighs 14 lbs (6.35 kg)\u003c\/li\u003e\n\u003cli\u003e2.5\" Dual-Speed HEX Focuser with 10 lbs (4.5 kg) Load Capacity\u003c\/li\u003e\n\u003cli\u003eEMD (Enhanced Multilayer Deposition) Coatings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Carbon Fiber with 2.5\" HEX Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FCD100 Series 127mm f\/7.5 Triplet \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eAPO Refractor\u003c\/a\u003e combines a 952mm focal length with a true air-spaced triplet optical system for imaging and visual observation. Its premium HOYA FCD100 ED glass element delivers true apochromatic color correction, housed in a carbon fiber tube that keeps the total OTA weight to just 14 lbs (6.35 kg). The 2.5\" HEX \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e supports heavy imaging gear up to 10 lbs (4.5 kg).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 127mm f\/7.5 Triplet: Apochromatic Correction with HOYA FCD100\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e is its 127mm air-spaced triplet objective, which uses a genuine HOYA FCD100 ED glass element to achieve true apochromatic performance. This design virtually eliminates chromatic aberration, the false color or purple fringing seen in less-corrected instruments.\u003c\/p\u003e\n\u003cp\u003eThe result is pinpoint stars against a black background and high-contrast detail on planetary targets. The f\/7.5 focal ratio provides a balance between image scale for smaller objects and a field of view wide enough for many larger nebulae, making it a highly capable instrument for both visual and photographic pursuits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCarbon Fiber Construction: 14 lbs and Thermal Stability\u003c\/h3\u003e\n\u003cp\u003eThe optical tube is constructed from carbon fiber, and the construction ensures portability without compromising rigidity or thermal stability. This keeps the total OTA weight at just 14 lbs (6.35 kg), making the 127mm aperture manageable on a wide range of medium-duty \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eFor astrophotography, a light tube also means less weight on the mount alongside the camera and accessories. Explore Scientific presents the carbon fiber 127 as a ready-to-go option for grab-and-go observing or serious imaging setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 2.5\" HEX Focuser: A 10 lb Payload Capacity for Imaging\u003c\/h3\u003e\n\u003cp\u003eAstrophotography puts the weight of the camera and its accessories on the focuser. The 2.5\" HEX focuser supports heavy imaging gear up to 10 lbs (4.5 kg), with smooth and precise focusing.\u003c\/p\u003e\n\u003cp\u003eA dual-speed mechanism allows for coarse adjustments to find focus quickly and fine adjustments to achieve critical sharpness for high-resolution imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEMD Coatings\u003c\/h3\u003e\n\u003cp\u003eEMD-enhanced coatings are among this telescope's features, and it delivers brilliant contrast and pinpoint detail. Multi-layer coatings reduce reflections that can cause ghosting and lower contrast.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Included 2-inch 99% Reflective Diagonal\u003c\/h3\u003e\n\u003cp\u003eFor visual observers, this telescope includes a high-quality 2-inch diagonal with 99% reflective coatings. This accessory is critical for comfortable viewing at high angles and ensures that the light gathered by the objective lens is not diminished before it reaches the \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThe 2-inch barrel accommodates wide-field, low-power eyepieces for sweeping views of star fields and large nebulae like the North America Nebula (NGC 7000). The 2026 catalog lists the FCD100 Series diagonal with a 1.25-inch adapter (in the aluminum models' columns); 1.25-inch eyepieces are the usual choice for higher magnification on the Moon, planets and double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilding an Imaging Train with the 127mm FCD100\u003c\/h3\u003e\n\u003cp\u003eWith its 952mm focal length and apochromatic optics, the 127mm FCD100 is a formidable imaging platform. The 2.5\" HEX focuser carries the camera and accessories, up to 10 lbs (4.5 kg).\u003c\/p\u003e\n\u003cp\u003eFor round stars toward the corners of larger sensors, a \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efield flattener\u003c\/a\u003e or focal reducer\/flattener is recommended, as with other refractors. The included Hybrid Finder Scope Base accepts legacy Explore Scientific finder brackets and mini dovetail-type finder brackets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFCD100 127mm Carbon Fiber vs. Aluminum\u003c\/h3\u003e\n\u003cp\u003eExplore Scientific offers the 127mm FCD100 in both carbon fiber and aluminum tube versions; the 2026 catalog notes the FCD100 Series is also available in lightweight carbon fiber. This carbon fiber model weighs 14 lbs (6.35 kg).\u003c\/p\u003e\n\u003cp\u003eExplore Scientific's published weight for the aluminum version is inconsistent (18 lbs and 10 kg in the same catalog row), so we do not quote a weight difference. Choose the carbon fiber version if a lighter tube matters most for your mount and travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific 127mm FCD100 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Explore Scientific 127mm FCD100 weighs 14 lbs (6.35 kg) and requires a robust equatorial mount for stable imaging. Choose a mount whose imaging capacity comfortably exceeds the telescope plus your camera and accessories. The FCD100 series uses a \"Universal Vixen Style\" mounting plate, so ensure your mount's \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e accepts a Vixen-style \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD100 glass in this 127mm refractor compare to other ED glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 is a premium extra-low dispersion (ED) glass with optical characteristics often compared to fluorite. It allows designers to create triplet objectives that achieve a very high level of color correction, virtually eliminating chromatic aberration. The result is brilliant contrast and pinpoint detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I expect to see of the Orion Nebula (M42) with the Explore Scientific 127mm FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 127mm aperture and apochromatic optics, you will resolve fine detail within the Orion Nebula (M42). The Trapezium cluster at its heart will be cleanly split into its four primary stars (and with good seeing, the E and F stars may be visible). The faint, nebulous \"wings\" of the nebula will show intricate structure and excellent contrast against a dark sky background, especially with a low-power, wide-field 2-inch eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 952mm focal length of the ES 127mm FCD100 a good match for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 952mm focal length provides an excellent image scale for many deep-sky objects. While the Andromeda Galaxy (M31) is exceptionally large, this focal length will perfectly frame its bright core and extensive dust lanes on a typical APS-C sensor. To capture the full 3-degree apparent width of M31 in a single frame, a focal reducer would be required to shorten the focal length and widen the field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the carbon fiber tube on the Explore Scientific 127mm FCD100 important for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fiber construction keeps the weight to 14 lbs (6.35 kg) without compromising rigidity or thermal stability. A lighter tube leaves more of the mount's capacity for the camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories do I need to start using the Explore Scientific 127mm FCD100 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is an \u003ca href=\"\/collections\/optical-tubes\"\u003eoptical tube assembly\u003c\/a\u003e (OTA) supplied with a 99% reflective 2-inch diagonal and a Hybrid Finder Scope Base. To begin observing, you will need at a minimum:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA sturdy equatorial mount\u003c\/li\u003e\n\u003cli\u003eEyepieces (both 2-inch and 1.25-inch formats)\u003c\/li\u003e\n\u003cli\u003eA finder scope or \u003ca href=\"\/collections\/finder-scopes\"\u003ered-dot finder\u003c\/a\u003e that fits the included base\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 2.5\" HEX focuser on the ES 127mm FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2.5\" HEX focuser supports heavy imaging gear up to 10 lbs (4.5 kg) and offers smooth and precise focusing for high-magnification observing or astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 127mm FCD100 a good telescope for viewing Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The apochromatic triplet optics provide high-contrast views with virtually no false color. With the 127mm aperture and 952mm focal length, you can easily use high-power eyepieces to resolve details like Jupiter's main cloud bands, the Great Red Spot, and the shadows of its moons transiting the planet's disk. The views will be sharp, detailed, and color-pure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat finder scope can I use with the included Hybrid Finder Scope Base?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included Explore Scientific Hybrid Finder Scope Base (ES-FB2N1-00) is designed to be versatile. It accepts legacy Explore Scientific finder scope brackets as well as finder scopes that use a mini dovetail-type bracket, such as those from Vixen, Synta, and Celestron. This gives you a wide range of options for attaching a finder scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" eyepieces with the included 2-inch diagonal on the 127mm FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eExplore Scientific's 2026 catalog lists the FCD100 Series 99% reflective 2-inch diagonal with a 1.25-inch adapter (in the aluminum models' columns). With a 1.25-inch adapter, the diagonal allows you to use both 2-inch eyepieces for wide-field, low-power views and standard 1.25-inch eyepieces, which are typically used for achieving higher magnifications for planetary and double star observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e952mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Dual-Speed HEX Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017812\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e14 lbs (6.35 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExplore Scientific 127mm FCD100 Carbon Fiber OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e99% Reflective 2-inch Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base (ES-FB2N1-00)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207862557,"sku":"ES-FCD100-127075-CF-01","price":3919.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FCD100-Series-127mm-f-7-5-Carbon-Fiber-Triplet-ED-APO-Refractor-Telescope-with-2-5-inch-HEX-Focuser-FCD100-127075-CF-1__10510.1594240395.1280.1280.jpg?v=1684338893"},{"product_id":"explore-scientific-ed152-triplet-in-carbon-fiber","title":"Explore Scientific ED152 Triplet in Carbon Fiber","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e152mm (6\") Aperture\u003c\/li\u003e\n\u003cli\u003ef\/8 Focal Ratio (1216mm Focal Length)\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eHOYA FCD1 Extra-Low Dispersion Glass\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube\u003c\/li\u003e\n\u003cli\u003e20.5 lbs Optical Tube Assembly Weight\u003c\/li\u003e\n\u003cli\u003e3.3\" Dual-Speed Focuser\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" Dielectric Diagonal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED152 Triplet in Carbon Fiber\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED152 Triplet combines a large 152mm aperture with an f\/8 optical system to deliver high-contrast, color-pure images for dedicated observers and astrophotographers. Its air-spaced triplet design incorporates genuine HOYA FCD1 glass to virtually eliminate chromatic aberration, while the advanced carbon fiber tube reduces the total weight to a remarkable 20.5 lbs. With a focal length of 1216mm, this instrument provides the resolving power needed for detailed planetary observation and deep-sky imaging from a surprisingly manageable platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe ED152 CF: A 152mm f\/8 APO for Advanced Imaging and Visual Astronomy\u003c\/h3\u003e\n\u003cp\u003eDesigned as a flagship instrument, the ED152 Carbon Fiber is a professional-grade \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromatic refractor\u003c\/a\u003e for the serious astronomer. Its 152mm (6\") objective and f\/8 focal ratio strike a critical balance, offering high magnification for planetary detail while maintaining a large enough image scale for many deep-sky targets. This is an instrument built for resolving fine details, from the Cassini Division in Saturn's rings to structure in bright nebulae.\u003c\/p\u003e\n\u003cp\u003eThe carbon fiber tube keeps the overall weight to just 20.5 lbs, making it remarkably portable for a telescope in this class. This also enables use with lighter \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e like the Losmandy G11 PMC-Eight, making the ED152 a viable option for both backyard observatories and dark-sky expeditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAir-Spaced Triplet Optics: HOYA FCD1 Glass for Apochromatic Correction\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED152 is an air-spaced triplet objective lens, the hallmark of a true apochromat (APO). This design uses three matched lenses, separated by a thin layer of air, to bring different wavelengths of light to a common focus. The result is crisp, color-corrected, high-contrast views across the field, without the purple fringing (chromatic aberration) common in simpler \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e designs.\u003c\/p\u003e\n\u003cp\u003eTo achieve this level of color correction, one of the three elements is made from genuine HOYA FCD1, a premium extra-low dispersion (ED) glass. This specific material has optical properties that allow for exceptional control over the light spectrum, so bright stars show little false color. This high-contrast, color-pure image is essential for discerning subtle details on planets and capturing accurate star colors in astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Power of 152mm: f\/8 Focal Ratio and 125% More Light Than a 102mm\u003c\/h3\u003e\n\u003cp\u003eAperture is the single most important factor in a telescope's ability to resolve fine detail and capture faint objects. The 152mm objective of the ED152 provides a significant jump in light-gathering power over smaller refractors. Compared to a 102mm model, the ED152 collects 125% more light, and 44% more than a 127mm refractor.\u003c\/p\u003e\n\u003cp\u003eThis light-gathering advantage translates directly to brighter images and shorter exposure times. Visually, you can resolve fainter stars in globular clusters like the Hercules Cluster (M13). For imagers, it means capturing more detail in the spiral arms of galaxies or the faint, extended nebulosity around targets like the Pleiades (M45) in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Grade Mechanics: The 3.3\" Dual-Speed Focuser\u003c\/h3\u003e\n\u003cp\u003eThe ED152 is equipped with a 3.3\" dual-speed \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e (Explore Scientific's item code TED15208CF-HEX33 and price list give the 3.3\" size). A large focuser leaves a wide opening for 2\" accessories and camera adapters at the back of a long-focus refractor.\u003c\/p\u003e\n\u003cp\u003eThe dual-speed mechanism allows for both coarse and fine adjustments, making it easy to quickly find the general focal point and then dial in critical focus with precision. This fine control is indispensable for high-resolution planetary imaging and ensuring pinpoint stars in long-exposure deep-sky photography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCarbon Fiber Construction: A 20.5 lb, 1041mm Optical Tube\u003c\/h3\u003e\n\u003cp\u003eA six-inch refractor is typically a heavy, cumbersome instrument, but the ED152's carbon fiber tube brings its weight down to a manageable 20.5 lbs. The retracted tube length is 1041mm, making it surprisingly transportable for its aperture class. The lower weight enables use with lighter equatorial mounts like the Losmandy G11 PMC-Eight.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Observing with the ED152: The Included 2\" Dielectric Diagonal\u003c\/h3\u003e\n\u003cp\u003eFor visual observers, the ED152 includes a high-quality 2\" \u003ca href=\"\/collections\/diagonals\"\u003edielectric diagonal\u003c\/a\u003e with 99% reflectivity. This essential accessory ensures that the maximum amount of light from the objective reaches your \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e, preserving the brightness and contrast of the image.\u003c\/p\u003e\n\u003cp\u003eThe 2\" barrel allows you to take full advantage of wide-field 2\" eyepieces, the widest views this 1216mm telescope can give, for sweeping through the rich star fields of the Milky Way. A 1.25\" adapter is also included, providing compatibility with the full range of standard eyepieces for high-power planetary and lunar observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAstrophotography with the ED152: A Stable Platform for Deep-Sky Imaging\u003c\/h3\u003e\n\u003cp\u003eThe combination of apochromatic optics, a stable carbon fiber tube, and a heavy-duty 3.3\" focuser makes the ED152 a formidable imaging platform. The 1216mm focal length provides excellent image scale for capturing detail in medium-sized to small galaxies and planetary nebulae. The f\/8 focal ratio is also forgiving on eyepiece selection.\u003c\/p\u003e\n\u003cp\u003eWhile the native optical system is highly corrected, astrophotographers using larger sensors will typically pair the telescope with a \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efield flattener\u003c\/a\u003e or reducer\/flattener, which corrects the field curvature of a refractor toward the corners of the image. There is no dedicated corrector for the ED152 in the material we have.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting the 20.5 lb ED152: Portability and Stability Considerations\u003c\/h3\u003e\n\u003cp\u003eWhile the 20.5 lb optical tube weight is exceptionally low for a 6-inch refractor, it still requires a stable, high-quality equatorial mount for optimal performance. The Explore Scientific Losmandy G11 PMC-Eight is an example of the lighter equatorial mounts the carbon fiber tube allows. For long-exposure astrophotography, add the camera and accessories and keep the total well within the mount's imaging capacity.\u003c\/p\u003e\n\u003cp\u003eThe reduced weight of the carbon fiber version not only widens the range of compatible mounts but also makes setup and transport easier. The 2026 catalog lists Vixen or Losmandy mounting for the ED152; check which \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail\u003c\/a\u003e your mount saddle takes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the carbon fiber tube on the Explore Scientific ED152 improve performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fiber tube reduces the optical tube's weight to just \u003cstrong\u003e20.5 lbs\u003c\/strong\u003e, making it usable on lighter, more portable equatorial mounts than a comparable aluminum tube, such as the Losmandy G11 PMC-Eight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific ED152 CF?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGiven its \u003cstrong\u003e20.5 lbs\u003c\/strong\u003e weight and \u003cstrong\u003e1041mm\u003c\/strong\u003e length, the ED152 Carbon Fiber needs a solid equatorial mount; the Explore Scientific Losmandy G11 PMC-Eight is an example of a lighter mount it can use. A stable mount is crucial to prevent vibrations and ensure sharp images, especially at the high magnifications this telescope can achieve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED152 triplet suitable for planetary viewing of Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 152mm apochromatic triplet optics are ideal for high-magnification planetary viewing. The \u003cstrong\u003eHOYA FCD1\u003c\/strong\u003e glass provides superb color correction, allowing you to see fine details like Jupiter's Great Red Spot, the Cassini Division in Saturn's rings, and subtle surface shadings on Mars with high contrast and virtually no color fringing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the advantages of the 152mm aperture for deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large \u003cstrong\u003e152mm\u003c\/strong\u003e aperture gathers significantly more light than smaller refractors (125% more than a 102mm), which is crucial for faint deep-sky objects. On the Orion Nebula (M42), this means you'll resolve the Trapezium cluster into more distinct stars and see fainter, more intricate structures within the surrounding gas clouds, both visually and in images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the ED152 perform on a large galaxy like Andromeda (M31) with a 2\" wide-field eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its \u003cstrong\u003e1216mm\u003c\/strong\u003e focal length, the ED152 provides a closer view of deep-sky objects. While you may not fit the entire Andromeda Galaxy (M31) in a single field with most eyepieces, you will gain a stunning, high-contrast view of its bright core and surrounding dust lanes. Using the included \u003cstrong\u003e2\" diagonal\u003c\/strong\u003e with a low-power 2\" eyepiece will provide the widest possible true field of view for framing large targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"air-spaced triplet\" mean for the ED152's optics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \"air-spaced triplet\" refers to an objective lens made of three individual glass elements separated by a thin cushion of air. This design gives optical engineers more variables to correct for chromatic aberration (false color) and other optical errors, resulting in the sharp, high-contrast, apochromatic images the ED152 produces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD1 glass in the ED152 affect image quality?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD1 is a high-grade, extra-low dispersion (ED) glass. Its primary function is to bend different colors of light to the same focal point with high precision. This drastically reduces chromatic aberration, leading to images with very little color fringing and higher contrast and sharpness, which is especially noticeable on bright objects like planets and bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the 3.3\" focuser on the ED152 over a standard 2\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e3.3\"\u003c\/strong\u003e focuser has a wider opening than a 2\" focuser, leaving room for 2\" diagonals and camera adapters. No load or vignetting figures are published for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific ED152 portable enough for field use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a 6-inch refractor, yes. The carbon fiber tube keeps the weight down to \u003cstrong\u003e20.5 lbs\u003c\/strong\u003e and the retracted length to \u003cstrong\u003e1041mm\u003c\/strong\u003e. It is remarkably portable for a telescope in this class. While it is not a grab-and-go telescope, it can be transported to a dark sky site with a suitable vehicle and a portable equatorial mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories are essential for imaging with the ED152?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor serious astrophotography, you will need a stable equatorial mount, a power source, and a camera. To ensure sharp stars across a large sensor, a field flattener or focal reducer\/flattener is highly recommended. You will also need a guiding solution (\u003ca href=\"\/collections\/autoguiding\"\u003eguide scope\u003c\/a\u003e and \u003ca href=\"\/collections\/guide-cameras\"\u003eguide camera\u003c\/a\u003e) to achieve sharp, long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ED152 come with a case?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, based on the included items list, the Explore Scientific ED152 Triplet in Carbon Fiber does not include a carrying or storage case. A case would need to be purchased separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e152mm (6\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.3\" Dual-Speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e20.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803035102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e1216mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e1041 mm (1320 mm with dew shield)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube outer diameter\u003c\/td\u003e\n\u003ctd\u003e165 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount included\u003c\/td\u003e\n\u003ctd\u003eNo (optical tube only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eED152 carbon fiber OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e99% reflective 2\" diagonal with 1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHybrid Finder Scope Base ES-FB2N1-00\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207895325,"sku":"ES-TED15208CF-HEX33","price":4480.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore-Scientific-ED152-Air-Spaced-Triplet-in-Carbon-Fiber-TED15208CF-HEXDD3-TED15208CF-HEXDD3-1__94308.1594240396.1280.1280.jpg?v=1684338895"},{"product_id":"william-optics-fluorostar-132","title":"William Optics Fluorostar 132","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003e132mm Aperture\u003c\/li\u003e\n  \u003cli\u003e910mm Focal Length\u003c\/li\u003e\n  \u003cli\u003ef\/6.9 Focal Ratio\u003c\/li\u003e\n  \u003cli\u003eFPL-53 Air-Spaced Apochromatic Triplet Objective\u003c\/li\u003e\n  \u003cli\u003e3.7\" Rack \u0026amp; Pinion Focuser with 360° Rotation\u003c\/li\u003e\n  \u003cli\u003eSTM Coatings, CNC-Machined Aluminium Tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n  \u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n  \u003cli\u003eFAQ\u003c\/li\u003e\n  \u003cli\u003eSpecifications\u003c\/li\u003e\n  \u003cli\u003eIn the Box\u003c\/li\u003e\n  \u003cli\u003eDownloads\u003c\/li\u003e\n  \u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n  \u003cli class=\"active\"\u003e\n    \u003cdiv\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section-center\"\u003e\n          \u003ch2\u003eWilliam Optics Fluorostar 132 APO Refractor\u003c\/h2\u003e\n          \u003cp\u003eThe William Optics Fluorostar 132 is a 132mm, 910mm, f\/6.9 \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromatic refractor\u003c\/a\u003e with a triplet air-spaced objective, STM coatings and FPL-53 glass, which William Optics designed for both deep-sky astrophotography and detailed planetary observations. William Optics' current model has a 3.7-inch rack-and-pinion \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e rotatable by 360 degrees.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFPL-53 Air-Spaced Triplet with STM Coatings\u003c\/h3\u003e\n\u003cp\u003eIt has a triplet air-spaced objective with STM coatings and FPL-53 glass, delivering sharp, color-corrected views.\u003c\/p\u003e\n\u003cp\u003eA 132mm objective has a Dawes limit of about 0.88 arcseconds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e132mm at f\/6.9\u003c\/h3\u003e\n\u003cp\u003eAt 910mm a full-frame sensor covers about 2.3 x 1.5 degrees and APS-C (about 23.5 x 15.6mm) about 1.5 x 1.0 degrees. That scale suits galaxies, planetary nebulae and the brighter parts of nebulae; very large targets need a mosaic or a reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFocuser Versions on This Page\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics' current page and price list describe a 3.7-inch rack-and-pinion focuser, rotatable by 360 degrees for precise focusing. The grey version on this page is that 3.7-inch model. The red and gold versions are listed with a 3.3-inch rack-and-pinion or a 3.5-inch Feather Touch focuser.\u003c\/p\u003e\n\u003cp\u003eWilliam Optics does not publish payload or travel figures for these focusers, so we do not.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFlatteners and Reducers William Optics Names\u003c\/h3\u003e\n\u003cp\u003eThe FLT132 is compatible with \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003efield flatteners\u003c\/a\u003e and reducers such as the P-FLAT68III, P-Flat7A and P-Flat8. None is included. Ask us which one suits your camera and the back focus it needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuild\u003c\/h3\u003e\n\u003cp\u003eThe tube is CNC-machined aluminium, and it comes with a high-quality soft carrying case. It is available in red, gold and grey.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use and Solar Safety\u003c\/h3\u003e\n\u003cp\u003eIts uses include detailed planetary observation. At 910mm, a 25mm \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e gives about 36x and a 7mm about 130x; how much you see depends on the seeing.\u003c\/p\u003e\n\u003cp\u003eNever aim the telescope or \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 132 suit Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics designed it for detailed planetary observations as well as deep-sky imaging. At 910mm a 7mm eyepiece gives about 130x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the FLT132 image the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eM31 spans about 3 degrees, more than the 2.3 x 1.5 degree full-frame field at 910mm, so it needs a mosaic or a reducer. Its core and companions fit individually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Fluorostar 132's objective?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA triplet air-spaced objective with STM coatings and FPL-53 glass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich focuser does the Fluorostar 132 have?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics' current model has a 3.7-inch rack-and-pinion focuser rotatable by 360 degrees; that is the grey version here. The red and gold versions are listed with a 3.3-inch rack-and-pinion or a 3.5-inch Feather Touch focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich field flatteners suit the FLT132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe matching options are the P-FLAT68III, P-Flat7A and P-Flat8. None is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Fluorostar 132 include a case?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics' page says it comes with a high-quality soft carrying case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does the Fluorostar 132 need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics' current material gives no weight for this model. Ask us for the weight with your configuration before choosing a mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the FLT132 for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOnly with proper solar filters installed on the front of the telescope. Never aim the telescope or finder at the Sun without proper solar filters installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the 360-degree focuser rotation for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTurning the camera to frame your target; the 3.7-inch focuser is rotatable by 360 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n    \u003ctable class=\"DAV-specifications\"\u003e\n      \u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e132mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Apochromatic Triplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Glass\u003c\/td\u003e\n\u003ctd\u003eFPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eSTM Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.7\" Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Rotation\u003c\/td\u003e\n\u003ctd\u003e360 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Construction\u003c\/td\u003e\n\u003ctd\u003eCNC-machined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Flatteners\u003c\/td\u003e\n\u003ctd\u003eP-FLAT68III, P-Flat7A, P-Flat8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFluorostar 132 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William_Optics_Fluorostar_132_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n            \u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\n          \u003c\/svg\u003e\n          \u003cdiv\u003e\n            \u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n          \u003c\/div\u003e\n        \u003c\/a\u003e\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red \/ 3.3\" R\u0026P","offer_id":44967227457821,"sku":"WO-A-F132RDIII-RP33R","price":5989.0,"currency_code":"CAD","in_stock":true},{"title":"Red \/ 3.5\" Feather Touch","offer_id":44967227556125,"sku":"WO-A-F132RDIII-FTR","price":7754.0,"currency_code":"CAD","in_stock":true},{"title":"Gold \/ 3.3\" R\u0026P","offer_id":44967227425053,"sku":"WO-A-F132GDIII-RP33R","price":5989.0,"currency_code":"CAD","in_stock":true},{"title":"Gold \/ 3.5\" Feather Touch","offer_id":44967227490589,"sku":"WO-A-F132GDIII-FTR","price":7754.0,"currency_code":"CAD","in_stock":true},{"title":"Grey \/ 3.3\" R\u0026P","offer_id":48966062702877,"sku":"WO-A-F132TGIV-RP37","price":6552.0,"currency_code":"CAD","in_stock":true},{"title":"Grey \/ 3.5\" Feather Touch","offer_id":48966062735645,"sku":"WO-A-F132TGIV-FT","price":7754.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT132-1.jpg?v=1722277044"},{"product_id":"william-optics-fluorostar-156","title":"William Optics Fluorostar 156","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e156mm Aperture Air-Spaced Triplet Apochromat\u003c\/li\u003e\n\u003cli\u003e1217mm Focal Length (f\/7.8)\u003c\/li\u003e\n\u003cli\u003eFPL-53 \u0026amp; Lanthanum Glass Elements\u003c\/li\u003e\n\u003cli\u003e3.7\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eSteel Objective Cell\u003c\/li\u003e\n\u003cli\u003eImage Circle \u0026gt; 44 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 156 f\/7.8 Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 156 is a 156mm, 1217mm, f\/7.8 \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromatic refractor\u003c\/a\u003e whose triplet lens system includes FPL-53 glass and a lanthanum element. William Optics designed it for both avid stargazers and serious astrophotographers. It has a steel objective cell, a 3.7-inch rack-and-pinion focuser, a Bahtinov mask in the \u003ca href=\"\/collections\/cases-and-covers\"\u003edust cover\u003c\/a\u003e, three CNC tube rings and a Losmandy-type \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail bar\u003c\/a\u003e. This page offers red, gold and space grey.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 156mm f\/7.8 Triplet with FPL-53 and Lanthanum\u003c\/h3\u003e\n\u003cp\u003eThe Fluorostar 156 delivers crisp, color-corrected visuals thanks to its triplet lens system incorporating FPL-53 glass and a lanthanum element.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e156mm aperture:\u003c\/strong\u003e a Dawes limit of about 0.74 arcseconds, and about 1.4 times the light of a 132mm objective.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1217mm focal length:\u003c\/strong\u003e full frame covers about 1.7 x 1.1 degrees, and APS-C (about 23.5 x 15.6mm) about 1.1 x 0.7 degrees, a scale for galaxies, globular clusters and planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSteel Objective Cell\u003c\/h3\u003e\n\u003cp\u003eThe sturdy steel objective cell mitigates thermal expansion and maintains alignment under varying temperatures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.7-inch Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics fits a 3.7-inch rack-and-pinion focuser for seamless, precise focusing adjustments. It does not publish payload or travel figures, so we do not.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImage Circle and Flatteners\u003c\/h3\u003e\n\u003cp\u003eOur specification gives an image circle greater than 44mm, which would cover a full-frame sensor (43.3mm diagonal). That figure and the \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflatteners\u003c\/a\u003e in our table come from dealer listings rather than William Optics' own page, so ask us to confirm the flattener and back focus for your camera before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBahtinov Mask, Three Tube Rings and Losmandy Bar\u003c\/h3\u003e\n\u003cp\u003eThe Fluorostar 156 comes standard with a Bahtinov mask integrated into the dust cover, three anodized CNC-made tube rings and a Losmandy-type dovetail bar. The white tube carries red, gold or space grey accents.\u003c\/p\u003e\n\u003cp\u003eTo focus with the mask, fit the dust cover, aim at a bright star and adjust focus until the central spike is centred between the other two.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use and Solar Safety\u003c\/h3\u003e\n\u003cp\u003eAvid stargazers are among its intended users. At 1217mm, a 25mm \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e gives about 49x and a 7mm about 174x; how much detail you see on planets depends on the seeing.\u003c\/p\u003e\n\u003cp\u003eNever aim the telescope or \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does the William Optics Fluorostar 156 need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA heavy \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mount\u003c\/a\u003e with a Losmandy \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e. William Optics' current page gives no weight, so ask us for the weight of your configuration before choosing a mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the FPL-53 and lanthanum elements do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe triplet with FPL-53 glass and a lanthanum element delivers crisp, color-corrected views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Bahtinov mask?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is built into the dust cover. Fit it, aim at a bright star, and adjust focus until the central diffraction spike sits centred between the other two.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor flat stars across a large sensor, a flattener is the usual choice with a triplet. Ask us to confirm the model and back focus for your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 156 suit Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 1217mm, a 7mm eyepiece gives about 174x. The visible detail depends on the seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 156 frame the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFull frame at 1217mm covers about 1.7 x 1.1 degrees, so M31 (about 3 degrees long) needs a mosaic. The core, M32 and M110 fit individually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes William Optics offer a reducer for the Fluorostar 156?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics' own page for this model names none. Ask us before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much can the 3.7-inch focuser carry?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics does not publish a payload figure for it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a guide scope to the Fluorostar 156?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWilliam Optics does not describe a \u003ca href=\"\/collections\/autoguiding\"\u003eguide scope\u003c\/a\u003e mount for this model. Ask us for options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Fluorostar 156 portable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 156mm and 1217mm on a heavy mount, it suits a fixed or semi-permanent setup more than travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e156mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1217mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Composition\u003c\/td\u003e\n\u003ctd\u003eFPL-53 \u0026amp; Lanthanum Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.7\" Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Cell Construction\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Accent Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Space Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Flatteners\u003c\/td\u003e\n\u003ctd\u003eFLAT68III, FLAT7A, FLAT8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFluorostar 156 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e3.7\" Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCNC Tube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLosmandy-style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967228080413,"sku":"WO-A-F156RD-RP37","price":10120.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967228014877,"sku":"WO-A-F156GD-RP37","price":11796.0,"currency_code":"CAD","in_stock":true},{"title":"Grey","offer_id":44967228047645,"sku":"WO-A-F156TG-RP37","price":11796.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT156-1.jpg?v=1722277379"},{"product_id":"william-optics-gran-turismo-71-apo-triplet","title":"William Optics Gran Turismo 71 APO Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e71mm Triplet Apochromatic Lens\u003c\/li\u003e\n\u003cli\u003e419mm Focal Length (f\/5.9)\u003c\/li\u003e\n\u003cli\u003e44mm Image Circle\u003c\/li\u003e\n\u003cli\u003e3-Element Objective with FPL-53 Glass\u003c\/li\u003e\n\u003cli\u003e2.5\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eOTA Weight: 2.95 kg (6.5 lbs)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Gran Turismo 71 APO Triplet\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Gran Turismo 71 APO Triplet combines a 71mm aperture with a 419mm focal length in a fast f\/5.9 optical design. Its triplet APO objective uses FPL-53 glass, which gives exceptional color correction and clarity, and the image circle is 44mm. The optical tube weighs 2.95 kg and has a 2.5-inch dual-speed rack-and-pinion \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e with 93mm of travel. This SKU, in red, comes with a CAA63 camera angle adjuster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e71mm f\/5.9 Optics\u003c\/h3\u003e\n\u003cp\u003eThe GT71 II has a 71mm objective, a 419mm focal length and an f\/5.9 focal ratio, which is ideal for capturing detailed celestial images. A 71mm objective has a Dawes limit of about 1.63 arcseconds.\u003c\/p\u003e\n\u003cp\u003eWith a full-frame sensor, 419mm gives about 4.9 x 3.3 degrees; with APS-C (about 23.5 x 15.6mm) about 3.2 x 2.1 degrees. That frames the Andromeda Galaxy (M31), the North America Nebula (NGC 7000) or the Orion Nebula region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFPL-53 Triplet APO\u003c\/h3\u003e\n\u003cp\u003eThe lens is a triplet APO prime lens, with an objective of 3 elements air-spaced with FPL53 glass. The FPL-53 glass provides exceptional color correction and clarity.\u003c\/p\u003e\n\u003cp\u003eThe body is CNC-machined aluminium with a retractable \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew shield\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e44mm Image Circle and Camera Formats\u003c\/h3\u003e\n\u003cp\u003eThe image circle is 44mm, and supported formats are full frame, APS-C and M4\/3. A full-frame sensor has a 43.3mm diagonal, so it sits just inside the circle.\u003c\/p\u003e\n\u003cp\u003eLike any triplet, the GT71 II focuses a curved field. For flat stars to the edge of a large sensor, there are two optional correctors, below.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5-inch R\u0026amp;P Focuser with 93mm Travel\u003c\/h3\u003e\n\u003cp\u003eIt has a robust 2.5-inch dual-speed focuser, rack-and-pinion, compatible with EAF (an electronic automatic focuser), with 93mm of travel. The rear takes the included M63 to 2-inch visual back.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-speed:\u003c\/strong\u003e a fine knob for small adjustments alongside the main knob.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF:\u003c\/strong\u003e The focuser is compatible with EAF.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCAA63:\u003c\/strong\u003e the included camera angle adjuster lets you turn the camera to frame your target.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptional FLAT GT 1.0x and FLAT 6AIII 0.8x\u003c\/h3\u003e\n\u003cp\u003eTwo optional \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflatteners\u003c\/a\u003e are available for the GT71 II.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFLAT GT 1.0x:\u003c\/strong\u003e keeps the native 419mm and f\/5.9.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFLAT 6AIII 0.8x:\u003c\/strong\u003e a reducer that gives about 335mm and f\/4.7. Full frame then covers about 6.2 x 4.1 degrees, and each sub-frame needs about 64% of the native exposure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAsk us for the back focus and adapters for your camera with either one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWeight, Length and Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe optical tube weighs 2.95 kg (6.5 lbs) and is 392mm long with the dew shield retracted, 470mm extended. The dovetail type is Vixen and Arca-Swiss, so it fits either style of \u003ca href=\"\/collections\/saddles-and-clamps\"\u003esaddle\u003c\/a\u003e. Add your camera and compare the total with your mount's rated payload.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use and Care\u003c\/h3\u003e\n\u003cp\u003eThe box includes an M63 to 2-inch visual back and a 2-inch to 1.25-inch visual back. Add a \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e and \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e for visual use; at 419mm a 20mm eyepiece gives about 21x and a 7mm about 60x. The GT71 suits both seasoned astronomers and beginners.\u003c\/p\u003e\n\u003cp\u003eMake sure the lens is dry before storing the telescope, and store it away from humidity. Never aim the telescope or \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the William Optics GT71 II be used with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFull frame is among its supported formats, and the image circle is 44mm (a full-frame diagonal is 43.3mm). For flat stars to the corners, use the optional FLAT GT 1.0x or FLAT 6AIII 0.8x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does the Gran Turismo 71 II need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tube weighs 2.95 kg. Add rings, camera and accessories and choose a mount whose rated payload covers the total with margin; the dovetail fits Vixen and Arca-Swiss saddles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the GT71 II frame the Andromeda Galaxy (M31) on full frame?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 419mm the field is about 4.9 x 3.3 degrees, so M31 (about 3 degrees long) fits with M32 and M110. With the FLAT 6AIII (about 335mm) it is about 6.2 x 4.1 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the GT71 II visually, for example on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The included M63 to 2-inch and 2-inch to 1.25-inch visual backs take a diagonal and eyepieces. At low power, 419mm frames the whole M42 region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does f\/5.9 mean for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt f\/5.9 each sub-frame needs roughly half the exposure of an f\/8 system for the same signal. With the FLAT 6AIII it becomes about f\/4.7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the FLAT GT 1.0x and FLAT 6AIII 0.8x?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FLAT GT 1.0x keeps 419mm (f\/5.9). The FLAT 6AIII 0.8x reduces to about 335mm (f\/4.7) for a wider field and shorter sub-frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use an EAF with the Gran Turismo 71 II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2.5-inch R\u0026amp;P focuser is compatible with EAF.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the included CAA63 for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a camera angle adjuster: it lets you turn the camera to frame your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow compact is the GT71 II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e392mm long with the dew shield retracted and 2.95 kg as a tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Gran Turismo 71 II a good choice for planetary imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts 419mm focal length is aimed at wide fields; planets need much more image scale, so a longer focal length is the usual choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003eTriplet APO Prime Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e71 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e419 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" R\u0026amp;P Focuser Compatible with EAF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e93 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Flattener\/Reducer\u003c\/td\u003e\n\u003ctd\u003eFLAT GT 1.0x, FLAT 6AIII 0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Type\u003c\/td\u003e\n\u003ctd\u003eVixen \u0026amp; Arca-Swiss Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e392 mm (retracted) - 470 mm (extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.95 kg \/ 6.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ Glass\u003c\/td\u003e\n\u003ctd\u003e3 elements, air-spaced, FPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eGran Turismo 71 APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to 2\" Visual Back Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Visual Back Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e360° Camera Angle Adjuster (CAA63)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Rings \u0026amp; Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William_Optics_Gran_Turismo_71_II_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967229260061,"sku":"WO-A-F71GTII-RD","price":1439.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-GT71-1.jpg?v=1722276408"},{"product_id":"william-optics-zenithstar-61ii-apo","title":"William Optics Zenithstar 61II APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e61mm Aperture Apochromatic Doublet Refractor\u003c\/li\u003e\n\u003cli\u003eOhara FPL-53 ED Glass Element\u003c\/li\u003e\n\u003cli\u003e360mm Focal Length (f\/5.9)\u003c\/li\u003e\n\u003cli\u003eIncludes Flat61A Field Flattener for Full-Frame Coverage\u003c\/li\u003e\n\u003cli\u003e2-inch Dual-Speed Rack \u0026amp; Pinion Focuser (10:1)\u003c\/li\u003e\n\u003cli\u003e2.2 kg Total Weight with Accessories\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask in Lens Cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Zenithstar 61II APO\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Zenithstar 61II APO combines a 61mm Ohara FPL-53 glass doublet with a fast f\/5.9 focal ratio and a 360mm focal length; the tube weighs 2.2 kg with accessories. Astrophotography and wildlife viewing are its intended uses. It comes with the Flat61A field flattener, a 2-inch dual-speed 10:1 rack-and-pinion \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e and a Bahtinov mask in the lens cap. This page offers it in grey or gold.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eApochromatic FPL-53 Doublet\u003c\/h3\u003e\n\u003cp\u003eThe objective is a doublet APO with an Ohara FPL-53 ED element. It delivers clear, high-contrast images with minimal color aberration.\u003c\/p\u003e\n\u003cp\u003eA doublet focuses a curved field, so for imaging the matching Flat61A flattener is used; for visual use the \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e goes straight into the focuser through the supplied adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e61mm Aperture at a Fast f\/5.9\u003c\/h3\u003e\n\u003cp\u003eThe combination of a 61mm aperture and a 360mm focal length results in a fast f\/5.9 focal ratio. This quick f\/5.9 focal ratio suits broad, detailed sky scans.\u003c\/p\u003e\n\u003cp\u003eWith a full-frame sensor, 360mm gives about 5.7 x 3.8 degrees; with APS-C (about 23.5 x 15.6mm) about 3.7 x 2.5 degrees. Either frames the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000) in one shot. A 61mm objective has a Dawes limit of about 1.9 arcseconds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFlat61A Flattener for Full-Frame Coverage\u003c\/h3\u003e\n\u003cp\u003eThe manual names the FLAT61A as the recommended flattener, and it is included. It flattens the field for imaging; the manual gives the image circle as greater than full frame and lists APS-C and full frame as camera formats. To fit it, twist off the adapter and thread the flattener onto the M54 telescope thread. Do not retract the focuser drawtube all the way in, as it could damage the lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2-inch 10:1 Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe 2-inch dual-speed rack-and-pinion focuser has a coarse knob and a 10:1 fine knob. Tension screws (2mm hex wrench) set its tension, and a thumb screw fixes the focuser. William Optics asks you not to adjust any unmarked screws, especially on the focuser retrofit, before contacting them.\u003c\/p\u003e\n\u003cp\u003eThe lens cap carries what the manual calls the W.O. patented diffraction spikes Bahtinov \u003ca href=\"\/collections\/focusing-masks\"\u003efocusing mask\u003c\/a\u003e, three times brighter than the traditional type. Aim at a bright star and focus until the central spike is centred.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e67.9mm Back Focus and M54 Imaging Train\u003c\/h3\u003e\n\u003cp\u003eThe manual gives the backfocus as 67.9 mm from the end of the Flat61A flattener to the camera sensor. The flattener threads onto the telescope's M54 thread and has an adjustable part.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor DSLR\/Mirrorless Cameras:\u003c\/strong\u003e The manual takes the T-mount to sensor distance as 55 mm, so the flattener's adjustable part is set to 12.9 mm (67.9 minus 55).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Dedicated Astro Cameras:\u003c\/strong\u003e Subtract the camera, \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e, \u003ca href=\"\/collections\/autoguiding\"\u003eOAG\u003c\/a\u003e and adapter distance (B) from 67.9 mm; the adjustable part makes up the difference (C).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC-Machined Body, Ring, Handle Bar and Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe body is CNC machined aluminium, with CNC made accessories included: a mounting ring, a CAT saddle handle bar and a 210 mm dual side dovetail plate suitable for Vixen and Arca Swiss type saddle plates. The \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew shield\u003c\/a\u003e retracts.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandle bar:\u003c\/strong\u003e a Vixen \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e type base that the manual says suits the W.O. UniGuide, with M4 thumb screws for a guiding scope, plus 1\/4 and 3\/8 threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing and focuser:\u003c\/strong\u003e M4 screws (2.5mm hex) hold the finder or guider scope base, and M6 screws attach the mounting ring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAdapters for 2-inch and 1.25-inch Visual Accessories\u003c\/h3\u003e\n\u003cp\u003eThe package includes an M54 to 2-inch adapter and a 2-inch to 1.25-inch adapter, each with M4 thumb screws. The visual path is a 2-inch \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e with a 2-inch eyepiece, or a 1.25-inch diagonal or erecting prism with a 1.25-inch eyepiece. Its uses include wildlife viewing. At 360mm, a 20mm eyepiece gives 18x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 2.2 kg Portable Imaging System\u003c\/h3\u003e\n\u003cp\u003eThe manual gives a tube weight of 2.2 kg with accessories, and a tube about 24 cm long with the dew shield retracted. A soft carry case is included. Add your camera and compare the total with your mount's rated payload.\u003c\/p\u003e\n\u003cp\u003eNever aim the telescope or finder at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics Zenithstar 61II ready for astrophotography out of the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt comes with the Flat61A flattener, the 2-inch dual-speed focuser and the Bahtinov mask cap. You add a T-mount or camera adapter and set the 67.9 mm backfocus from the flattener to the sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the FPL-53 glass do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Ohara FPL-53 ED element is what makes the doublet an APO; it gives clear, high-contrast images with minimal color aberration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount suits the Zenithstar 61II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 2.2 kg with accessories, a small equatorial mount or \u003ca href=\"\/collections\/star-trackers\"\u003estar tracker\u003c\/a\u003e can carry it; add your camera and compare the total with the mount's rated payload. The dual dovetail fits Vixen and Arca Swiss saddles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Zenithstar 61II frame the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 360mm, full frame covers about 5.7 x 3.8 degrees and APS-C about 3.7 x 2.5 degrees; M31 (about 3 degrees long) fits on either.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Zenithstar 61II a good choice for viewing planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can see planets with the Z61II, its strength is wide-field deep-sky viewing and imaging. Its short 360mm focal length is not designed for the high magnification needed to resolve fine details on planets like Jupiter and Saturn. A telescope with a much longer focal length would be a better choice for dedicated planetary observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Zenithstar 61II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The manual shows an M48 filter connected at the end of the flattener: remove part A, thread on the filter, then refit part A.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the CAT saddle handle bar for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCarrying the telescope, and mounting a guide scope: the manual says its Vixen finder type base suits the W.O. UniGuide, with M4 thumb screws and 1\/4 and 3\/8 threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the 67.9mm back focus for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a DSLR or mirrorless camera on a T-mount (55 mm to the sensor), set the flattener's adjustable part to 12.9 mm. For an astronomy camera, subtract the camera, filter wheel, OAG and adapter distance from 67.9 mm and set the adjustable part to the difference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich saddles does the dovetail fit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual says the 210 mm dual side dovetail plate suits Vixen and Arca Swiss type saddle plates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Zenithstar 61II for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Use the supplied M54 to 2-inch and 2-inch to 1.25-inch adapters with a diagonal or erecting prism and an eyepiece. Wildlife viewing is among its uses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003eGrey, Gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eApochromatic doublet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e61 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e360 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ Glass\u003c\/td\u003e\n\u003ctd\u003eDoublet, Ohara FPL-53 ED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Connection\u003c\/td\u003e\n\u003ctd\u003eM54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2\" dual-speed rack \u0026amp; pinion (10:1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.2 kg (accessories included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003e210 mm Vixen \/ Arca-Swiss dual-side plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching Flattener\u003c\/td\u003e\n\u003ctd\u003eFLAT61A (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZenithstar 61 II APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFlat61A Field Flattener\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring with CAT Saddle Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e210mm Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cap with Integrated Bahtinov Mask\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54 to 2\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William_Optics_ZenithStar_61_II_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Grey","offer_id":44967230898461,"sku":"WO-A-Z61IITG","price":914.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":51501958594845,"sku":"WO-A-Z61IIGD","price":914.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WO-Z-61-II-Grey-1.jpg?v=1722104068"},{"product_id":"apm-140mm-f-7-fpl-53-doublet-apo-refractor-2-5-focuser","title":"APM 140mm F\/7 FPL 53 Doublet APO Refractor - 2.5\" Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet SD Apo 140 f\/7 FPL53 \u0026amp; Lanthanium H-LAF53 Optical Tube\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eThe new APM 140mm f\/980mm Doublet is a mold breaker with high quality. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 140- SD Apo features a Doublet lens cell using SD glass FPL-53 to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 140mm SD APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cspan\u003eColorless optics with FLP53 glass and \u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan\u003eLanthan H-LAF53 \u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 2.5\" focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cspan\u003eWith 980mm focal length, the 140-SD Apo is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eTraditional APM quality has been applied in all areas. The new 2.5\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs.\u003cspan\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the SD APO 140 f \/ 7, we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 735mm at f \/ 5.25) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWith the new 140 mm SD Apo we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings with handle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2.5\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLosmandy-Style Dovetail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/apm-140mm-doublet-apo-refractor-r3161\"\u003eReview (Cloudy Nights)\u003c\/a\u003e\u003c\/div\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL-53 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e140 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e980 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eMulticoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.83\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.5 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e280 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2.5\" APM Focuser, 360° rotatable, with 1:10 Micro Focusing\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e157 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1030 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e830 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength of dewcap:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e290 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e9,0 kg ( with Tuberings, handle, 3\" dovetail )\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665795357,"sku":"APM140-7-2.5ZTA","price":4977.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-140mm-F-7-FPL-53-Doublet-APO-Refractor-2-5-inch-Focuser-1__82048.1600124047.1280.1280.jpg?v=1684345498"},{"product_id":"apm-140mm-f-7-fpl-53-doublet-apo-refractor-3-7-zta-focuser","title":"APM 140mm F\/7 FPL 53 Doublet APO Refractor - 3.7\" ZTA Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet SD Apo 140 f\/7 FPL53 Optical Tube\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eThe new APM 140mm f\/980mm Doublet is a mold breaker with high quality. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 140- SD Apo features a Doublet lens cell using SD glass FPL-53 to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 140mm SD APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eColorless optics with FLP53 glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 3.7 \"focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003eWith 980mm focal length, the 140-SD Apo is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 3.7\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. \u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the SD APO 140 f \/ 7, we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 735mm at f \/ 5.25) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eWith the new 140 mm SD Apo we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings with handle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e3.7\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLosmandy-Style Dovetail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/apm-140mm-doublet-apo-refractor-r3161\"\u003eReview (Cloudy Nights)\u003c\/a\u003e\u003c\/div\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL-53 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e140 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e980 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eMulticoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.83\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.5 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e280 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e3.7\" R\u0026amp;P Focuser, Rotation 360°\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1030 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e830 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength of dewcap:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e290 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e9.8Kg (with tuberings)\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665828125,"sku":"APM140-7-3.7ZTA","price":5391.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-140mm-F-7-FPL-53-Doublet-APO-Refractor-3-7-inch-ZTA-Focuser-1__50236.1600124048.1280.1280.jpg?v=1684345500"},{"product_id":"apm-152mm-f-8-fpl-51-doublet-apo-refractor-2-5-focuser","title":"APM 152mm F\/8 FPL 51 Doublet APO Refractor - 2.5\" Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet ED Apo 152 f\/7.9 Optical Tube with Accessories\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe  APM 152-1200 Doublet is a mold breaker in the 6\" Refractor category. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 152-1200ED features a Doublet lens cell using ED glass of FPL-51 complimented by a Lanthanum  element to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003eWith a generous 1200mm focal length, the 152-1200ED is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eThe new 152-1200ED is also supplied with extensive accessories. Inside the quality Aluminium transport case you will find not only a fantastic value telescope but also a newly designed 2.5\" focuser, CNC tube rings incorporating a carrying handle, 330mm Losmandy style dovetail and finder bracket.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 2.5\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. Of course, if you would like to use a Starlight Instruments Feather Touch (model FTF3035B-A) then this can be supplied as an option, for that reason the tube end has an thread M109 x 1 and M95 x 1 to accept a 3\" or 2.5\" Starlight focuser.\u003cbr\u003e\u003cbr\u003eImaging accessories for the 152-1200 include a 2.5\" (Order Nr. TSFlat2,5) field flattener which maintains focal length. There is also a dedicated Massimo Riccardi designed APM Reducer (Order Nr.  APM-RIRED152-1200S-2L or APM-RIRED152-1200-2L). This changes the focal length by a factor of x0.75, resulting in a 900mm focal length and fast f5.9 aperture.\u003cbr\u003e\u003cbr\u003eWith the new 152-1200ED we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2,5\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2\"\/1,25\" del. adapter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCarrying Case\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/review-of-the-apm-152-ed-serial-number-245-r3175\"\u003eReview (Cloudy Night)\u003c\/a\u003e\u003c\/div\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL51 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7.9\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1200 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eBroadband Mulitcoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.76\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.7 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e300 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2.5\" Rack and Pinion Focuser with 1:10 Micro Focusing\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eM68, 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e156 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1220 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1020 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e23.6 lb incl. Tuberings and 3\" Dovetail, 18.6 lb Tube only without Caps\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eyes\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e26.4 lb\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e55,66\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eEyepiece adapter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eto 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665926429,"sku":"APM-152-1200-FPL51\/La-D-2.5ZTA","price":4977.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-152mm-F-8-FPL-51-Doublet-APO-Refractor-2-5-inch-Focuser-1__31812.1600124049.1280.1280.jpg?v=1684345527"},{"product_id":"apm-152mm-f-8-fpl-51-doublet-apo-refractor-3-7-zta-focuser","title":"APM 152mm F\/8 FPL 51 Doublet APO Refractor - 3.7\" ZTA Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Refractor Telescope Doublet ED Apo 152 f\/7.9 OTA with 3.7\" focuser\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe new APM 152-1200 Doublet is a mold breaker in the 6\" Refractor category. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 152-1200ED features a Doublet lens cell using ED glass equivalent to FPL-51 complimented by a Lanthanum  element to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 152 mm ED APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eColorless optics with FLP51 glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 3.7 \"focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003eWith a generous 1200mm focal length, the 152-1200 ED is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eThe new 152-1200ED is also supplied with extensive accessories. Inside the quality Aluminium transport case you will find not only a fantastic value telescope but also a newly designed 3,7\" focuser, CNC tube rings incorporating a carrying handle, 330mm Losmandy style dovetail and finder bracket.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 3,7\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. Also new is our 2\" APM  Fast Lock adapter now .\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the ED Apo 152 f\/1200 , we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 900mm at f \/ 5.9) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eWith the new 152-1200ED we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e3,7\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2\"\/1,25\" del. adapter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCarrying Case\u003c\/li\u003e\n\u003cli\u003eAdapter M82 x 1 ID ( Backfokus 230 mm )\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M82 x 1 OD to M68 x 1 ID\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M68 x 1 OD to M63 x 1 ID\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M63 x 1 OD to 2\" APM Fast Lock  ( backfocus 180 mm )\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/review-of-the-apm-152-ed-serial-number-245-r3175\"\u003eReview (Cloudy Night)\u003c\/a\u003e\u003c\/div\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL51 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7.9\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1200 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eBroadband Mulitcoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.76\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.7 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e300 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e3.7\" R\u0026amp;P Focuser, Rotation 360°\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eM68, 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e156 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1220 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1020 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eyes\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e26.4 lb\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e55,66\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eEyepiece adapter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eto 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e25.6 lb incl. Tuberings and 3\" Dovetail, 20.6 lb Tube only without Caps\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967666155805,"sku":"APM-152-1200-FPL51\/La-D-3.7ZTA","price":5184.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-152mm-F-8-FPL-51-Doublet-APO-Refractor-3-7-inch-ZTA-Focuser-1__58999.1600124049.1280.1280.jpg?v=1684345549"},{"product_id":"sharpstar-sca260-v2-260mm-f-5-super-cassegrain-astrograph","title":"SharpStar SCA260 V2 260mm f\/5 Super Cassegrain Astrograph","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e260mm (10.2\") Aperture Aspherical Primary Mirror\u003c\/li\u003e\n\u003cli\u003e1300mm Focal Length at a fast f\/5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eMassive 80mm Corrected Image Circle for Large Format Sensors\u003c\/li\u003e\n\u003cli\u003eLightweight Carbon Fiber Tube Weighing 14.5kg\u003c\/li\u003e\n\u003cli\u003e3.35\" Focuser with 360° Rotator and 70mm Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar SCA260 V2 260mm f\/5 Super Cassegrain Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar SCA260 V2 is an imaging instrument designed for large-format sensors, combining a 260mm aspherical primary mirror and a fast f\/5 optical system to produce a massive 80mm corrected image circle. With a native focal length of 1300mm, it achieves a theoretical resolution of 0.46 arc-seconds, capable of capturing fine detail in distant galaxies and faint nebulae. The entire \u003ca href=\"\/collections\/optical-tubes\"\u003eoptical tube assembly\u003c\/a\u003e weighs only 14.5kg thanks to its carbon fiber construction, making it manageable for a wide range of \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e260mm Aspherical Primary and 3-Element Corrector System\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the SCA260 V2 is a 260mm aspherical primary mirror, a design that demands a far more sophisticated manufacturing and testing process than a simple spherical mirror. This advanced optical surface provides superior correction across the field. The primary is made from PZ33, a Pyrex-like glass that is more stable than the mirror materials traditionally used, which helps the optics stay consistent as temperatures change overnight.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Aluminum Coatings:\u003c\/strong\u003e Both the primary mirror and the 120mm spherical secondary mirror feature high-reflectivity coatings that deliver more than 95% reflectivity, resulting in brighter images and shorter exposure times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-Element Corrector:\u003c\/strong\u003e A 3-inch, three-element air-spaced corrector sits in the optical path. SharpStar uses it so the whole system can better achieve full-frame imaging and keep vignetting under control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAspherical Advantage:\u003c\/strong\u003e By correcting optical aberrations at the primary mirror itself, the design achieves a higher level of sharpness and contrast, which is critical for resolving fine details across the enormous imaging field.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Massive 80mm Corrected Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe SCA260 V2 has an 80mm image circle. The 3-inch three-element corrector is there so the f\/5 system can better achieve full-frame imaging and control vignetting, which makes the \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e a strong match for large-sensor CMOS and CCD cameras.\u003c\/p\u003e\n\u003cp\u003eThis enormous field of view allows you to capture vast nebulae complexes and galaxy clusters in a single frame, or create ultra-high-resolution mosaics with fewer panels. A full-frame sensor (43mm diagonal) and a medium-format chip such as the IMX461 (55mm diagonal) both fit well inside the 80mm circle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Imaging Advantages of a 1300mm f\/5 System\u003c\/h3\u003e\n\u003cp\u003eThe combination of a 260mm aperture and a 1300mm focal length strikes a powerful balance between image scale and light-gathering power. The f\/5 focal ratio is much faster than slower f\/8 or f\/10 systems, allowing you to collect data on faint deep-sky objects much more quickly. This speed reduces individual sub-exposure times, minimizing the impact of tracking errors and changing atmospheric conditions.\u003c\/p\u003e\n\u003cp\u003eWith a theoretical resolution of 0.46 arc-seconds, the SCA260 V2 has the resolving power to capture intricate details in spiral arms of galaxies like the Whirlpool Galaxy (M51) and resolve individual stars in dense clusters like the Hercules Cluster (M13). The 1300mm focal length provides the ideal image scale for many popular deep-sky targets when paired with modern CMOS sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e14.5kg Carbon Fiber Tube and Thermal Stability\u003c\/h3\u003e\n\u003cp\u003eThe optical tube is constructed from a lightweight yet rigid carbon fiber material. This offers two key advantages for astrophotography: a high stiffness-to-weight ratio and minimal thermal expansion. The total OTA weight of 14.5kg places it within the payload capacity of many popular mid-to-high-end equatorial mounts.\u003c\/p\u003e\n\u003cp\u003eCarbon fiber's near-zero coefficient of thermal expansion means that the distance between the primary and secondary mirrors remains constant as the temperature drops. This keeps the focal point stable throughout a long imaging session, preventing focus drift that can ruin hours of data. As with any large \u003ca href=\"\/collections\/reflectors\"\u003ereflector\u003c\/a\u003e, give the telescope time outdoors to reach ambient temperature before imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.35\" Focuser, 360° Rotator, and 70mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe SCA260 V2 is equipped with a dedicated 3.35\" \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e whose load capacity SharpStar has upgraded, so it carries imaging accessories with no slippage and smooth operation. SharpStar also extended its travel to 50mm for greater practicability. The rear of the focuser incorporates several features essential for a modern imaging setup.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° Rotator:\u003c\/strong\u003e A 360° \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003erotator\u003c\/a\u003e at the rear of the focuser lets you frame your target without loosening the camera, which helps when composing mosaics or finding a guide star. SharpStar placed it behind the focusing unit so an EAF cable does not get tangled as you rotate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70mm Back Focus:\u003c\/strong\u003e A generous 70mm of back focus is available from the M48x0.75 thread, providing ample room for accessories like \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheels\u003c\/a\u003e, and \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guiders\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Connections:\u003c\/strong\u003e The focuser includes a system of adapter rings for M68x1, M54x0.75, and M48x0.75 threads, making it easy to connect to most imaging cameras and accessories on the market. A built-in 2-inch filter thread is also included for added flexibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting Points and Simplified Optical Alignment\u003c\/h3\u003e\n\u003cp\u003eThe SCA260 V2 is designed for practical field use. It includes a CNC-machined handle bar that not only makes transport easier but also serves as a mounting platform for guide scopes or other accessories.\u003c\/p\u003e\n\u003cp\u003eSharpStar has also simplified the optical axis mechanics: to adjust the secondary mirror, you only need to work its pull rod. Like any reflecting telescope, the SCA260 V2 benefits from a collimation check from time to time, and keeping it aligned is how you get the most out of its 0.46 arc-second resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat imaging sensors can the SharpStar SCA260 V2's 80mm image circle cover?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 80mm image circle is large enough to fully illuminate professional-grade sensors with minimal vignetting. This includes \u003cstrong\u003efull-frame sensors\u003c\/strong\u003e (e.g., IMX455, 43mm diagonal) and \u003cstrong\u003emedium-format sensors\u003c\/strong\u003e (e.g., IMX461, 55mm diagonal), making it an ideal choice for creating large-scale mosaics and imaging wide fields of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the f\/5 focal ratio of the SCA260 V2 benefit deep-sky imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn f\/5 focal ratio is considered fast for an astrograph of this aperture. It allows you to collect a significant amount of light in a shorter period compared to slower f\/8 or f\/10 systems. This reduces individual sub-exposure times, which can lessen the impact of tracking errors and changing atmospheric conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the PZ33 primary mirror material in the SCA260 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePZ33 is a borosilicate glass with a very low coefficient of thermal expansion, similar to Pyrex. This means the mirror's shape remains stable as the temperature drops throughout the night, preventing the focal point from shifting. This thermal stability is critical for maintaining sharp focus during long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I collimate the SharpStar SCA260 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSharpStar simplified the optical axis mechanics of the SCA260 V2: the secondary mirror is adjusted with its pull rod. Check alignment with a star test from time to time and adjust only when the star shows it is needed. The collimation manual in the Downloads tab was written for the SCA260F5, so some of its steps may not apply to the V2.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I image the entire Veil Nebula (NGC 6960) with the SCA260 V2 and a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Veil Nebula complex spans approximately 3 degrees of the sky. With the SCA260 V2's 1300mm focal length and a full-frame sensor (like a ZWO ASI6200), you can capture large sections of the nebula in a single frame and create a high-resolution mosaic of the entire complex in just a few panes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat class of mount is required for the 14.5kg tube weight of the SCA260 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGiven the 14.5kg tube weight, plus the additional weight of a large camera, guide scope, and other accessories, a mount with an imaging payload capacity of at least 25-30kg (55-66 lbs) is recommended for stable, long-exposure astrophotography. Mounts in the Sky-Watcher EQ8, iOptron CEM70\/CEM120, or equivalent class are appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1300mm focal length of the SCA260 V2 good for planetary imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SCA260 V2 is built as a deep-sky astrograph, and no planetary figures are published for it. Its 260mm aperture has a theoretical resolution of 0.46 arc-seconds, but at 1300mm the image scale is small for planets, and the large 120mm secondary mirror lowers contrast on fine planetary detail. It is at its best on galaxies, nebulae and star clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the carbon fiber tube help with focus stability on the SCA260 V2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCarbon fiber has a near-zero coefficient of thermal expansion. This means that as temperatures drop during an imaging session, the tube does not shrink like an aluminum or steel tube would. This keeps the critical spacing between the primary and secondary mirrors constant, preventing the focal point from shifting and ensuring your images remain sharp all night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the M68, M54, and M48 threads on the SCA260 V2 let me do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis system of included adapter rings provides maximum flexibility for connecting your imaging equipment. The larger M68 and M54 threads are ideal for connecting large format cameras and accessories directly to prevent vignetting, while the M48x0.75 adapter is the standard for connecting most full-frame cameras, filter wheels, and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar SCA260 V2 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SCA260 V2 is an astrograph, designed and corrected for photographic use. Its limiting visual magnitude is 13.8, but no \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e setup is described, and the large 120mm secondary mirror will result in a significant central obstruction, which reduces contrast on planetary and lunar details compared to a telescope designed for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e260mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrected Image Circle\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Type\u003c\/td\u003e\n\u003ctd\u003eAspherical Reflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Material\u003c\/td\u003e\n\u003ctd\u003ePZ33 (Pyrex-like)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Type\u003c\/td\u003e\n\u003ctd\u003eSpherical Reflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Minor Axis\u003c\/td\u003e\n\u003ctd\u003e120mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced lens structure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.35\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus (from M48 thread)\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e304mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e14.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.46 arc-seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Visual Magnitude\u003c\/td\u003e\n\u003ctd\u003e13.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ Camera-Side Connection\u003c\/td\u003e\n\u003ctd\u003eM68x1 \/ M54x0.75 \/ M48x0.75 adapter rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eSuper Cassegrain astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar SCA260 V2 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar_SCA260F5_Collimation_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967740866845,"sku":"SSO-SCA260V2","price":6461.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-SCA260-1__12455.1608934024.1280.1280.jpg?v=1684345748"},{"product_id":"sharpstar-150mm-f-2-8-hnt-hyperbolic-newtonian-astrograph","title":"SharpStar 15028HNT-AL 150mm f\/2.8 Hyperbolic Newtonian Astrograph","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e150mm Aperture Hyperbolic Newtonian Astrograph\u003c\/li\u003e\n\u003cli\u003e420mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/2.8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003e55mm Back-Focus from M48x0.75 Thread\u003c\/li\u003e\n\u003cli\u003e6kg Gross Weight (including rings and plate)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 15028HNT-AL 150mm f\/2.8 Hyperbolic Newtonian Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 15028HNT-AL is an imaging instrument engineered for speed, delivering a 420mm focal length from its 150mm aperture at an exceptionally fast f\/2.8 focal ratio. Its hyperbolic primary mirror and integrated corrector produce a flat, fully illuminated 44mm image circle, covering full-frame sensors with a vast 6-degree field of view. The entire system, including the tube ring and 200mm Losmandy-style dovetail plate, weighs just 6kg, making it a portable and powerful solution for wide-field deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e150mm f\/2.8 Hyperbolic Optics: A 44mm Flat-Field System\u003c\/h3\u003e\n\u003cp\u003eThe optical core of the 15028HNT-AL is its 150mm hyperbolic primary mirror, a more advanced design than the parabolic mirrors found in standard \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonians\u003c\/a\u003e. This specific figure is engineered to work as a complete system with the built-in corrector, enabling superior off-axis correction across a large 44mm image circle. The mirror is made from PZ33, a low-expansion Pyrex-type glass that ensures thermal stability as ambient temperatures change during an imaging session.\u003c\/p\u003e\n\u003cp\u003eTo deliver its expansive 6-degree field of view, a three-element, air-spaced corrector is integrated directly into the \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e assembly. This design, which includes one ED (Extra-low Dispersion) glass element, is optimized for the hyperbolic primary, eliminating coma and ensuring pinpoint stars to the edge of a full-frame sensor. By integrating the corrector, the system removes the complexity of matching a third-party \u003ca href=\"\/collections\/coma-correctors\"\u003ecoma corrector\u003c\/a\u003e and guarantees the specified 55mm back-focus distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Design: A 4.8kg OTA with Rigid Secondary Support\u003c\/h3\u003e\n\u003cp\u003eThe 15028HNT-AL is built from all-metal components, with an aluminum main tube 443mm long and an OTA weight of 4.8kg. The secondary mirror bracket is CNC-machined in one integrated piece with no misalignment, a rigid design that ensures clean diffraction spikes. The primary mirror cell features three sets of adjustment screws, each with a locking screw, for precise and stable collimation.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e uses a 70mm secondary mirror, which SharpStar sizes to give sufficient illumination for full-frame imaging. This results in a central obstruction of 46.7%, a necessary trade-off for achieving this level of speed and field coverage. This mainly lowers contrast for visual observation; for imaging, flat frames take care of any uneven illumination across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3kg Capacity Focuser: 20mm of Travel and 360° Rotation\u003c\/h3\u003e\n\u003cp\u003eAn astrograph's focuser must be rigid enough to carry a modern imaging train without flexure. The 15028HNT-AL is equipped with a dual-speed rack-and-pinion focuser capable of supporting a 3kg payload. The focuser provides 20mm of travel for achieving sharp focus and is compatible with most electronic \u003ca href=\"\/collections\/electronic-focusers\"\u003eauto-focusers\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eA built-in 360° \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003ecamera rotator\u003c\/a\u003e is positioned at the front of the focuser, allowing for effortless framing of your target without disturbing focus or alignment. The camera connects via a standard M48x0.75 thread, and the optical design provides a standard 55mm of back-focus from this mounting surface, simplifying camera and accessory spacing. SharpStar ships the focuser and rotator locked, so loosen the locking screws before first use to avoid damaging them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting \u0026amp; Accessories: 200mm Losmandy Plate and Handle Bar\u003c\/h3\u003e\n\u003cp\u003eDesigned for portability and rapid deployment, the SharpStar 15028HNT-AL has a total weight of just 6kg, including its sturdy tube ring (with enlarged hand screws that open and close without tools) and a 200mm Losmandy-style dovetail plate. The compact 443mm tube length makes it easy to balance on a wide range of \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e. The package also includes a 200mm handle bar, and a finder base on the side of the tube provides an additional mounting point for a \u003ca href=\"\/collections\/finder-scopes\"\u003efinder scope\u003c\/a\u003e or other astronomical accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCollimation Tools: Precision Alignment for a 0.77\" Resolution System\u003c\/h3\u003e\n\u003cp\u003eTo maintain its theoretical 0.77 arc second resolution, precise collimation is essential. SharpStar collimates the telescope at the factory, but transport knocks or cleaning can shift the optical axis. The box contains a collimating adapter, a collimating eyepiece, a 1.25\" adapter and a T8 Torx wrench, allowing you to accurately align the optical axis; the mirror adjustment and locking screws take 2.5mm, 3mm and 4mm Allen wrenches, which are not in the box list. The manual provides a detailed, step-by-step visual guide for adjusting both the secondary and primary mirrors, ensuring you can achieve peak performance from the hyperbolic optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e15028HNT-AL vs. 6\" f\/4 Newtonians: The f\/2.8 Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 6\" f\/4 Newtonian is a capable imaging instrument, the SharpStar 15028HNT-AL is purpose-built for a higher tier of astrophotography. The primary differences lie in optical speed and field correction.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExposure Time:\u003c\/strong\u003e At f\/2.8, the 15028HNT-AL gathers light approximately twice as fast as an f\/4 system. This means a 5-minute exposure on the 15028HNT-AL collects the same signal as a 10-minute exposure on an f\/4 scope, effectively doubling your imaging efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Correction:\u003c\/strong\u003e The 15028HNT-AL's hyperbolic mirror and built-in corrector are designed as a single optical system to produce a flat 44mm field. A standard f\/4 Newtonian requires a separate coma corrector that may not fully correct the field or illuminate a full-frame sensor without vignetting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Design:\u003c\/strong\u003e The hyperbolic design allows for sharper stars at the edge of the 6-degree field compared to what a standard parabolic mirror and separate corrector can typically achieve, especially on large sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the SharpStar 15028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a gross weight of 6kg (including tube ring, dovetail plate and handle bar), the SharpStar 15028HNT-AL is well-suited for mid-range equatorial mounts. For optimal tracking and guiding, a mount in the payload class of a \u003ca href=\"\/products\/sky-watcher-heq5-mount\"\u003eSky-Watcher HEQ5\u003c\/a\u003e, iOptron CEM26, or larger is recommended, especially once a camera and \u003ca href=\"\/collections\/autoguiding\"\u003eguide scope\u003c\/a\u003e are added.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of a hyperbolic primary mirror in the 15028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA hyperbolic mirror is part of an advanced optical design that works in tandem with the built-in three-element corrector. This system is specifically engineered to achieve a wider, flatter, and better-corrected 44mm image circle than a standard parabolic mirror paired with a general-purpose coma corrector.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the correct 55mm back-focus for my camera with the SharpStar 15028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard 55mm back-focus is measured from the M48x0.75 thread. You achieve this distance by using a combination of extension tubes and adapters, such as an M48 T-ring for a DSLR or a set of spacers for a dedicated astronomy camera, to place your camera's sensor at the correct distance from the threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SharpStar 15028HNT-AL frame large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SharpStar 15028HNT-AL is ideal for such targets. With its 420mm focal length and 6-degree field of view on a full-frame sensor, it can easily capture the entirety of the North American Nebula (NGC 7000) and the neighboring Pelican Nebula (IC 5070) in a single, richly detailed frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 15028HNT-AL good for imaging small galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the 15028HNT-AL can image the Whirlpool Galaxy (M51), its wide 420mm focal length is optimized for large nebulae and star fields. M51 will appear relatively small in the frame. The astrograph's strength is capturing such galaxies within the context of their surrounding stellar environment, not high-magnification detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use an electronic autofocuser (EAF) with the SharpStar 15028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The dual-speed rack-and-pinion focuser on the 15028HNT-AL is designed to be compatible with most common electronic auto-focusers (EAFs). This allows for precise, automated focusing, which is critical for a fast f\/2.8 system where the critical focus zone is very narrow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to buy a separate coma corrector for the 15028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The 15028HNT-AL has a three-element corrector, including one ED element, built into the focuser. This corrector is specifically designed for the hyperbolic primary mirror and provides a flat 44mm image circle without the need for any additional accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 15028HNT-AL suitable for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 15028HNT-AL is a dedicated astrograph designed for imaging. While you can technically use an eyepiece with the included 1.25\" adapter, the large 46.7% central obstruction from the 70mm secondary mirror will significantly reduce contrast, making it less than ideal for visual use compared to a telescope designed for that purpose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the included collimation tools for the 15028HNT-AL do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included collimating adapter and collimating eyepiece are used to precisely align the primary and secondary mirrors. A fast f\/2.8 system is very sensitive to miscollimation, and these tools are essential for achieving the sharpest possible stars across the entire 6-degree field of view. The 1.25\" adapter and T8 Torx wrench in the box are part of the same procedure; the mirror screws themselves take 2.5mm, 3mm and 4mm Allen wrenches, which are not in the box list.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 6kg weight of the 15028HNT-AL benefit my setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 6kg gross weight (including the tube ring, 200mm dovetail plate and handle bar) keeps the payload modest. It rides on mid-range equatorial mounts with room left for a camera and guiding gear, which keeps the overall weight and complexity of your field setup down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Size\u003c\/td\u003e\n\u003ctd\u003e150mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e420mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View\u003c\/td\u003e\n\u003ctd\u003e6 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack-Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Type\u003c\/td\u003e\n\u003ctd\u003eHyperbolic reflective mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Material\u003c\/td\u003e\n\u003ctd\u003ePZ33 (Pyrex-type glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eThree-element air-spaced (inc. one ED element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Minor Axis\u003c\/td\u003e\n\u003ctd\u003e70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.77 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Visual Magnitude\u003c\/td\u003e\n\u003ctd\u003e12.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e4.8kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e6kg (including tube ring and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e193mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Length\u003c\/td\u003e\n\u003ctd\u003e443mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eDual-speed rack and pinion, with camera rotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser travel\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e3kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003e200mm Losmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction\u003c\/td\u003e\n\u003ctd\u003e46.7% (70mm secondary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian reflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpStar 15028HNT-AL OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e200mm Losmandy-style dovetail plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e200mm handle bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCollimating adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCollimating eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eT8 Torx wrench\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWarranty card\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar_15028HNT-AL_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967747715357,"sku":"SSO-15028HNT-AL","price":2765.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SSO-15028HNT-AL.png?v=1755111762"},{"product_id":"askar-fra400-72mm-f-5-6-quintuplet-apo","title":"Askar FRA400 72mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e72mm Aperture Quintuplet APO Lens\u003c\/li\u003e\n\u003cli\u003e400mm Focal Length at f\/5.6\u003c\/li\u003e\n\u003cli\u003e44mm Natively Flat Image Circle\u003c\/li\u003e\n\u003cli\u003e140mm Available Back Focus from M68x1 Thread\u003c\/li\u003e\n\u003cli\u003e3\" Rack-and-Pinion Focuser with 1:10 Fine Focus\u003c\/li\u003e\n\u003cli\u003e360° Field Rotator for Precise Framing\u003c\/li\u003e\n\u003cli\u003e2.88kg Total Weight with Rings and Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA400 72mm f\/5.6 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA400 is a portable imaging instrument built around a 72mm f\/5.6 quintuplet objective with built-in field correction and a 44mm full-frame image circle. Its 400mm focal length suits large nebulae and star fields, while the optical tube weighs just 2.56kg. The back focus is 140mm from the end of the \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003erotator\u003c\/a\u003e's M68x1 thread, and the total weight of this 317mm-long Flat-field Refractive \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eAstrograph\u003c\/a\u003e (FRA) with tube rings and dovetail plate is 2.88kg.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Askar FRA400: A Portable 72mm Full-Frame Astrograph\u003c\/h3\u003e\n\u003cp\u003eFRA stands for \"Flat-field Refractive Astrograph\": a \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e with built-in flat field correction. The FRA400 is the pioneering model of the series and has been a bestseller since its launch.\u003c\/p\u003e\n\u003cp\u003eAskar adds that the FRA can also be applied in visual observation. The included 1.25\" and 2\" adapters take standard diagonals and eyepieces for wide views of star clusters and nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet APO Optics: A 44mm Flat Field with Two ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe optical core of the FRA400 is a five-element (quintuplet) Petzval-like design that is fully air-spaced. Two of the five elements are special extra-low dispersion (ED) glass, and the design is excellent in controlling chromatic aberration.\u003c\/p\u003e\n\u003cp\u003eThe FRA400's quintuplet layout has built-in field correction, so there is no separate flattener and no back focus to calculate: users only need to achieve focus when shooting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e400mm Focal Length at f\/5.6: Framing the Largest Nebulae\u003c\/h3\u003e\n\u003cp\u003eThe combination of a 400mm focal length and 72mm aperture results in a native focal ratio of f\/5.6. With a full-frame sensor the field is about 5.1 x 3.4 degrees, enough to frame the Andromeda Galaxy (M31), the North American Nebula (NGC 7000) or the Veil Nebula complex.\u003c\/p\u003e\n\u003cp\u003ef\/5.6 is a relatively fast focal ratio for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 44mm Image Circle: Full-Frame Coverage, No Flattener Needed\u003c\/h3\u003e\n\u003cp\u003eThe FRA400 supports a 44mm full-frame image circle, larger than the roughly 43.3mm diagonal of a full-frame sensor.\u003c\/p\u003e\n\u003cp\u003eThe key benefit of the FRA series is built-in field correction.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Additional Flattener:\u003c\/strong\u003e You do not need to purchase, install, or space a separate field flattener, which simplifies your imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplified Setup:\u003c\/strong\u003e Users don't need to worry about calculating back focus, as long as the object is focused.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e140mm Back Focus from the M68x1 Thread\u003c\/h3\u003e\n\u003cp\u003eThe FRA400's back focus is 140mm, measured from the end of the rotator's M68x1 male thread to the focal plane.\u003c\/p\u003e\n\u003cp\u003eYour imaging train, such as an \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e, a \u003ca href=\"\/collections\/filter-wheels-and-drawers\"\u003efilter drawer\u003c\/a\u003e and the camera, sits within that distance. Askar includes an M68-M48 conical adapter, a 2\" adapter and a 1.25\" adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3\" Rack-and-Pinion Focuser: Precision Control and 360° Framing\u003c\/h3\u003e\n\u003cp\u003eThe FRA400 is equipped with a 3-inch rack-and-pinion focuser with a 360-degree rotator and an M68×1 thread.\u003c\/p\u003e\n\u003cp\u003eIts features:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1:10 Fine Adjustment:\u003c\/strong\u003e For more precise calibration in observation or imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° Rotator:\u003c\/strong\u003e A built-in rotator lets you frame your target at any angle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptional 0.7x Reducer: f\/3.9\u003c\/h3\u003e\n\u003cp\u003eFor imagers seeking an even wider field of view and shorter exposure times, Askar offers the dedicated F3.9 Full Frame Reducer for the FRA400. This optional 0.7x reducer turns the telescope into a 280mm f\/3.9 astrograph; at f\/3.9 the same exposure takes about 49% of the time needed at f\/5.6.\u003c\/p\u003e\n\u003cp\u003eThe reducer has 3 air-spaced elements, a 44mm image circle, a 72mm maximum outer diameter and a standard 55mm back focus. It has a built-in M48×0.75 thread for 2-inch filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePairing the FRA400 with Your Camera and Accessories\u003c\/h3\u003e\n\u003cp\u003eThe FRA400 works with DSLRs, mirrorless bodies and dedicated astronomy cameras up to full frame, connected through the included M68-M48 conical adapter.\u003c\/p\u003e\n\u003cp\u003eA typical full-frame imaging train might consist of your camera, an off-axis guider for precise tracking, and a filter drawer for narrowband or \u003ca href=\"\/collections\/lrgb-filters\"\u003eLRGB filters\u003c\/a\u003e. This stack is built within the 140mm from the rotator's M68x1 male thread, and the included M68-M48 adapter steps down to M48.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Design: Tube, Rings, and Mounting Hardware\u003c\/h3\u003e\n\u003cp\u003eThe FRA400 is built with portability and functionality in mind. The optical tube has a retractable dew shield (lens hood).\u003c\/p\u003e\n\u003cp\u003eIt comes with a pair of multifunctional patented tube rings, with attachments available on three sides of the rings. A multi-functional handle sits on top of the rings and a dovetail plate on the bottom.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWeight, Dimensions, and What's in the Box\u003c\/h3\u003e\n\u003cp\u003eThe optical tube assembly (OTA) alone weighs only 2.56kg (5.6 lbs). With the included tube rings, handle, and dovetail plate, the total weight is 2.88kg (6.3 lbs).\u003c\/p\u003e\n\u003cp\u003eIts overall length is 317mm. The package includes the FRA400 OTA, a pair of tube rings, a handle, a dovetail plate and an M68-M48 conical adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eYour First Night Out with the Askar FRA400\u003c\/h3\u003e\n\u003cp\u003eGetting started with the FRA400 is straightforward thanks to its integrated design. After mounting the telescope to your equatorial mount, attach your camera using the appropriate adapters. Build your imaging train within the 140mm from the rotator's M68x1 thread.\u003c\/p\u003e\n\u003cp\u003eBalance the setup in both Right Ascension and Declination. Once aligned, point to a bright star and use a \u003ca href=\"\/collections\/focusing-masks\"\u003eBahtinov mask\u003c\/a\u003e to achieve critical focus with the 1:10 fine-focus knob. Use the 360° rotator to frame your target perfectly, lock everything down, and you are ready to begin capturing images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"FRA\" mean for the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFRA\u003c\/strong\u003e stands for \u003cstrong\u003eF\u003c\/strong\u003elat-field \u003cstrong\u003eR\u003c\/strong\u003eefractive \u003cstrong\u003eA\u003c\/strong\u003estrograph. It is a refractor with built-in flat field correction, which can also be used for visual observation. You do not need a separate field flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to buy a separate field flattener for the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The quintuplet (5-element) objective lens design has built-in field correction and supports a 44mm image circle. Attach your full-frame or smaller sensor camera and focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar FRA400's 44mm image circle work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard full-frame sensor has a diagonal of approximately 43.3mm. The Askar FRA400's 44mm image circle is slightly larger than that, and the 400mm focal length gives about 5.1 x 3.4 degrees on full frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar FRA400 suitable for a portable \"grab-and-go\" setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With an optical tube weight of 2.56kg and a total weight of 2.88kg with rings and dovetail, the Askar FRA400 is light, and its 317mm length makes it easy to transport to dark-sky sites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 140mm back focus on the Askar FRA400 mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAskar measures it from the end of the rotator's M68x1 thread to the focal plane. Your imaging train fits within it, for example:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter drawer or wheel:\u003c\/strong\u003e For LRGB or \u003ca href=\"\/collections\/narrowband-filters\"\u003enarrowband filters\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-Axis Guider (OAG):\u003c\/strong\u003e For guiding through the main optics.\u003c\/li\u003e\n\u003c\/ul\u003e\nAskar says you don't need to calculate back focus as long as the object is focused.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA400 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The FRA can also be applied in visual observation. The included 2\" and 1.25\" adapters allow you to use standard diagonals and eyepieces for wide-field views of star clusters like the Pleiades (M45) and large nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach my DSLR or mirrorless camera to the FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a T-ring specific to your camera's lens mount (e.g., Canon EF, Nikon F, Sony E) with an M48 connection, threaded onto the included M68-M48 conical adapter. M48 extension tubes may be needed to reach focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Use a filter drawer or \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e with M48 threads after the included M68-M48 adapter. The optional F3.9 reducer has a built-in M48×0.75 thread for 2-inch filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it safe to look at the Sun with the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo. Do not look at the Sun through the telescope.\u003c\/strong\u003e It will cause irreversible damage to your eyes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar FRA400 and a full-frame camera frame the Cygnus Loop?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Cygnus Loop, including the Veil Nebula (NGC 6960 and NGC 6992), spans over 3 degrees of the sky. With a full-frame camera, the Askar FRA400's 400mm focal length provides a field of view of roughly 5.1° x 3.4°. This is wide enough to frame the whole loop in one shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e72mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet dual ED air-spaced APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e140mm (from M68x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e317mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.56kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (with rings \u0026amp; plate)\u003c\/td\u003e\n\u003ctd\u003e2.88kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003eM68x1 Male Thread, 2\" Adapter, 1.25\" Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3\" rack and pinion, 1:10 fine focus, 360° rotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching Reducer\u003c\/td\u003e\n\u003ctd\u003eAskar F3.9 Full Frame Reducer (0.7x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar FRA400 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings (Pair)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM68-M48 Conical Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInspection List\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967765082397,"sku":"ASK-FRA400","price":1679.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA400-1__17210.1610295680.1280.1280.jpg?v=1684345825"},{"product_id":"askar-fra600-108mm-f-5-6-quintuplet-apo","title":"Askar FRA600 108mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e108mm Aperture\u003c\/li\u003e\n\u003cli\u003e600mm Focal Length (f\/5.6)\u003c\/li\u003e\n\u003cli\u003eQuintuplet Flat-Field APO Optical Design\u003c\/li\u003e\n\u003cli\u003e66mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003e6.5kg Total Weight (including tube rings)\u003c\/li\u003e\n\u003cli\u003e4.2\" Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA600 108mm f\/5.6 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA600 is an \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e with a 108mm quintuplet objective, a 66mm image circle and a native f\/5.6 focal ratio. Its Petzval design, with two ED glass elements and a built-in field flattener, sits in a 493mm optical tube. The total weight with tube rings and dovetail plate is 6.5kg and the back focus is 160mm from the end of the \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003erotator\u003c\/a\u003e's M90x1 thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 5-Element Petzval System with 2 ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe core of the FRA600 is its 5-element (quintuplet) optical system, built on a Petzval design. It uses a front triplet and a rear doublet, two of them ED (Extra-low Dispersion) glass, which provides a high level of apochromatic performance for astroimaging.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"\/products\/askar-3-f-3-9-full-frame-reducer-for-fra600\"\u003efield flattener\u003c\/a\u003e is built in, so there is no external flattener to buy or space and no back focus to calculate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e108mm Aperture at a Native f\/5.6\u003c\/h3\u003e\n\u003cp\u003eThe 108mm aperture gathers light for faint detail, and the 600mm focal length suits a wide range of targets at a native f\/5.6.\u003c\/p\u003e\n\u003cp\u003eWith a full-frame sensor the field is about 3.4 x 2.3 degrees, which frames the Andromeda Galaxy (M31); the whole Cygnus Loop needs a mosaic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 66mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe FRA600's 66mm image circle ensures excellent star shape across the entire field while controlling chromatic aberration and minimizing distortion. It covers the full-frame (36x24mm) format with margin.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Frame:\u003c\/strong\u003e The 66mm circle covers full-frame DSLR, mirrorless and \u003ca href=\"\/collections\/cameras\"\u003eastronomy camera\u003c\/a\u003e sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Separate Flattener:\u003c\/strong\u003e The Petzval design provides its own field correction, so there is no external flattener to buy or space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80mm Rear Group:\u003c\/strong\u003e The two rear lenses are 80mm in diameter, which counterbalances the fall-off in field illumination.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e160mm of Back Focus and Adapter Versatility\u003c\/h3\u003e\n\u003cp\u003eThe back focus is 160mm, measured from the end of the rotator's M90x1 male thread to the focal plane. Your \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e, \u003ca href=\"\/collections\/filter-wheels-and-drawers\"\u003efilter drawer\u003c\/a\u003e and camera sit within it, and there is no need to calculate the back focus. Without the rotator, the \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e also offers an M108x1 male thread.\u003c\/p\u003e\n\u003cp\u003eAskar includes a sectional conical adapter that steps M90×1 to M68×1, M54×0.75 and M48×0.75. For visual use, 2\" and 1.25\" adapters are included for diagonals and \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 4.2\" Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe FRA600 has a large 4.2\" rack-and-pinion focuser with a standard 1:10 fine adjustment knob. It raises the payload to a pro level and operates smoothly without slipping with heavy imaging equipment attached.\u003c\/p\u003e\n\u003cp\u003eFor framing your target, a 360° rotator is integrated into the focuser assembly. This lets you set the camera angle without loosening the imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Optional Askar 0.7x F3.9 Reducer\u003c\/h3\u003e\n\u003cp\u003eFor imagers seeking an even wider field of view and faster imaging times, the Askar FRA600 works with the optional Askar 3\" F3.9 Full Frame Reducer. This 4-element 0.7x reducer gives 420mm at f\/3.9, so the same exposure takes about 49% of the time needed at f\/5.6. It supports a 44mm image circle, has a standard 55mm back focus and a built-in M48×0.75 2-inch filter thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 493mm Tube\u003c\/h3\u003e\n\u003cp\u003eThe optical tube has a diameter of 125mm and measures 493mm with its dew shield retracted; it is a great portable 4\" astrograph. It comes with a pair of multifunctional red anodized tube rings, a multi-functional handle and a dovetail plate.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield:\u003c\/strong\u003e Retracts for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube Rings:\u003c\/strong\u003e Mounting points on three sides for accessories such as a guide scope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e6.5kg with Rings and Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe total weight of the FRA600, including the tube rings and dovetail plate, is 6.5kg.\u003c\/p\u003e\n\u003cp\u003eIts 493mm retracted length makes it easy to take to dark-sky sites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the Askar FRA600's 66mm image circle?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003e66mm image circle\u003c\/strong\u003e covers a full-frame sensor (43.3mm diagonal) with margin, and it ensures excellent star shape across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my full-frame DSLR or mirrorless camera to the Askar FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can connect your camera using the included sectional conical adapter. This adapter terminates in a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. A camera-specific M48 \u003ca href=\"\/collections\/imaging-adapters\"\u003eT-ring\u003c\/a\u003e attaches the camera body. There is no need to calculate a specific back focus distance; you simply attach your camera and use the focuser to achieve a sharp image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar FRA600 be used for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The FRA600 is also suited to high-quality visual observation, with chromatic aberration correction and good contrast. It includes standard \u003cstrong\u003e2\" and 1.25\" adapters\u003c\/strong\u003e to accommodate any standard diagonal and eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar FRA600 frame large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt \u003cstrong\u003e600mm\u003c\/strong\u003e with a full-frame sensor the field is about 3.4 x 2.3 degrees, enough for most of the North American Nebula (NGC 7000); with the neighboring Pelican Nebula (IC 5070), plan a two-panel mosaic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to calculate back focus for the Askar FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. For native f\/5.6 imaging, you do not need to calculate a specific back focus distance. It has \u003cstrong\u003e160mm of back focus\u003c\/strong\u003e from the end of the rotator's M90x1 thread; you attach your camera and focus. The optional 0.7x reducer has its own standard 55mm back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the threads on the included conical adapter for the Askar FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included sectional conical adapter provides multiple standard threads to connect your imaging equipment. It steps down from the focuser's native M90x1 thread to \u003cstrong\u003eM68x1\u003c\/strong\u003e, \u003cstrong\u003eM54x0.75\u003c\/strong\u003e, and \u003cstrong\u003eM48x0.75\u003c\/strong\u003e threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the optional 0.7x reducer change the Askar FRA600's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optional \u003cstrong\u003eAskar 3\" F3.9 Full Frame Reducer (0.7x)\u003c\/strong\u003e turns the telescope into a 420mm f\/3.9 system. The same exposure takes about 49% of the time needed at f\/5.6, and the reducer supports a 44mm full-frame image circle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar FRA600 suitable for imaging the Andromeda Galaxy (M31) with an APS-C camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn an APS-C sensor (about 23.5 x 15.6mm) the field at 600mm is about 2.2 x 1.5 degrees, which frames the bright body and dust lanes of the Andromeda Galaxy (M31) tightly; the full-frame field gives more room.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow portable is the Askar FRA600 for travel to dark sites?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a great portable 4\" astrograph. The retracted length is \u003cstrong\u003e493mm\u003c\/strong\u003e and the weight with rings and dovetail is \u003cstrong\u003e6.5kg\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhere can I attach accessories on the Askar FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe multifunctional red anodized tube rings have mounting points on three sides, which makes it easy to attach accessories such as a guide scope. A multi-functional handle sits on top.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e108mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e600mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Type\u003c\/td\u003e\n\u003ctd\u003eQuintuplet flat-field APO (including two ED elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e66mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e160mm (from the end of rotator M90x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e493mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e6.5kg (Including tube ring \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Packing Weight\u003c\/td\u003e\n\u003ctd\u003e7.8kg (not including Aluminum case)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack-end Adapter\u003c\/td\u003e\n\u003ctd\u003eM108x1 male thread (no rotator), M90x1 male thread, 2\" adapter \/ 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConical Adapter Threads\u003c\/td\u003e\n\u003ctd\u003eM90×1 to M68×1 to M54x0.75 to M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e4.2\" rack and pinion, 1:10 fine focus, 360° rotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e125mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching Reducer\u003c\/td\u003e\n\u003ctd\u003eAskar 3\" F3.9 Full Frame Reducer (0.7x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFRA600 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings (Pair)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSectional Conical Tube Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInspection List\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967778779421,"sku":"ASK-FRA600","price":3639.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA600-1__27560.1610296043.1280.1280.png?v=1684345835"},{"product_id":"william-optics-fluorostar-91","title":"William Optics Fluorostar 91","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e91mm Aperture Apochromatic Triplet\u003c\/li\u003e\n\u003cli\u003eFPL-53 Glass\u003c\/li\u003e\n\u003cli\u003eFocal Length: 540mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/5.9\u003c\/li\u003e\n\u003cli\u003eStrehl Ratio: \u0026gt; 0.95\u003c\/li\u003e\n\u003cli\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eImage Circle: \u0026gt;43mm\u003c\/li\u003e\n\u003cli\u003eWeight: 4.2 kg (OTA Only)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 91 APO Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 91 is an apochromatic triplet \u003ca href=\"\/collections\/refractors\"\u003erefractor\u003c\/a\u003e built around a 91mm objective lens with FPL-53 glass, and a Strehl ratio exceeding 0.95. It has a 540mm focal length, f\/5.9, an image circle greater than 43mm, a dual-speed 3.3-inch rack-and-pinion \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e, a 360° \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003efield rotator\u003c\/a\u003e, a 2-inch RotoLock and an integrated saddle handle. The optical tube weighs 4.2 kg. This page offers grey, gold and red.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWhat the Fluorostar 91 Is For\u003c\/h3\u003e\n\u003cp\u003eThe FLT91 is a precision-engineered apochromatic triplet refractor for discerning astronomers and astrophotographers, a mid-sized telescope whose features provide stability for both visual and photographic use.\u003c\/p\u003e\n\u003cp\u003eAt 540mm it suits medium-scale deep-sky imaging and, with its RotoLock visual back and extension tube in the box, visual observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFPL-53 Triplet with a Strehl Ratio Over 0.95\u003c\/h3\u003e\n\u003cp\u003eIt is a 91mm apochromatic triplet with FPL-53 glass, delivering sharp, high-contrast images and a Strehl ratio exceeding 0.95.\u003c\/p\u003e\n\u003cp\u003eThe manual describes a new lens cell design with FPL-53 glass in the WO triplet series (GT and FLT), designed for temperature compensation to better prevent pinched optics in cold weather.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e91mm Aperture and 540mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eA 91mm objective has a Dawes limit of about 1.27 arcseconds. At 540mm a full-frame sensor covers about 3.8 x 2.5 degrees, and APS-C (about 23.5 x 15.6mm) about 2.5 x 1.7 degrees. With the Flat6AIII (0.8x, about 432mm and f\/4.7) full frame covers about 4.8 x 3.2 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImage Circle\u003c\/h3\u003e\n\u003cp\u003eThe image circle is greater than 43mm. A full-frame sensor's \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e is 43.3mm, at the edge of that figure; APS-C sits well inside. For flat stars on a large sensor, use one of the matching \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflatteners\u003c\/a\u003e (below).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 3.3-inch Dual-Speed Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe focuser is a dual speed 3.3-inch rack-and-pinion with a 10:1 ratio fine knob and cap, a focuser adjusting knob with a thermometer, and a focuser rotation locking screw.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock:\u003c\/strong\u003e do not over-tighten the focuser lock screw, and release it when focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoothness:\u003c\/strong\u003e push and pull gear spacing screws (3mm and 2mm Allen keys), adjusted only when necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF:\u003c\/strong\u003e the gear spacing screws can be removed to attach a motor such as an EAF (electronic automatic focuser): remove the top screw (2mm Allen key), release the two inner knob screws, remove the knob, align the screw holes, lock the two set screws on the shaft and tighten both bracket screws. With a motor fitted, do not over-tighten the tension screw.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM92 Threads and Camera Angle Rotator\u003c\/h3\u003e\n\u003cp\u003eThe focuser ends in an M92 thread. In the box, a visual extension tube and the 2-inch RotoLock visual back screw onto it. For imaging, unscrew the extension tube and screw the flattener onto the M92 thread.\u003c\/p\u003e\n\u003cp\u003eThe 360° field rotator turns the camera for framing: release the camera angle rotation locking screw, turn the camera, then lock it again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFlatteners William Optics Names\u003c\/h3\u003e\n\u003cp\u003eThe FLT91 is compatible with the Flat 6AIII, Flat 68III and Ultra Flat 91, and allows precise back-focus adjustments. The manual shows spot diagrams for two of them:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eP-FLAT6AIII-M92 (0.8x):\u003c\/strong\u003e about 432mm and f\/4.7; screws onto the focuser's M92 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eP-FLAT68III (1x):\u003c\/strong\u003e keeps 540mm and f\/5.9; screws onto the M92 thread, with an optional longer adjusting adapter for the FLT91.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra Flat 91:\u003c\/strong\u003e named as compatible; ask us for details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use: Extension Tube and 2-inch RotoLock\u003c\/h3\u003e\n\u003cp\u003eThe manual's accessories map shows the visual path: extension tube and 2-inch RotoLock, then a 2-inch diagonal and \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e, or a 2-inch to 1.25-inch adapter with a 1.25-inch diagonal or erecting prism. At 540mm, a 25mm eyepiece gives about 22x and a 7mm about 77x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDew Shield, Bahtinov Mask and Mounting Hardware\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBahtinov mask:\u003c\/strong\u003e in the lens cover, marked patented; the front cover threads on at M121.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew shield:\u003c\/strong\u003e retractable, 122mm across, with a lock screw.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e \u003ca href=\"\/collections\/rings\"\u003emounting rings\u003c\/a\u003e with knobs on a long version Vixen-style dovetail plate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e120mm saddle handle bar:\u003c\/strong\u003e M4 locking screws and M4 and M6 screw holes; remove the two bracket holder screws (2.5mm Allen key) before fitting a finder bracket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWeight and Length\u003c\/h3\u003e\n\u003cp\u003eThe manual gives 4.165 kg (9.18 lbs) for the optical tube and 5.575 kg (12.29 lbs) with ring, dovetail and saddle; William Optics' page rounds these to 4.2 and 5.6 kg. Length is 441mm retracted and 510mm extended. A soft carry case is included. Add your camera and compare the total with your mount's rated payload.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCare and Storage\u003c\/h3\u003e\n\u003cp\u003eBefore storing the telescope, leave it uncovered with the tube open long enough to adjust to room temperature, and make sure it is completely dry. Store it in a dry place with a consistent temperature.\u003c\/p\u003e\n\u003cp\u003eNever aim the telescope or \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Fluorostar 91 an apochromatic triplet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts three-element objective with FPL-53 glass. The Strehl ratio exceeds 0.95.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 360° rotator help with astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt lets you turn the camera to frame your target: release the camera angle rotation locking screw, rotate, and lock it again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich flatteners suit the Fluorostar 91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe options are the Flat 6AIII (0.8x), Flat 68III (1x) and Ultra Flat 91. None is included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame camera with the Fluorostar 91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual gives an image circle greater than 43mm, and a full-frame diagonal is 43.3mm, so full frame is at the edge. Use a William Optics flattener and ask us about corner coverage for your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 91 frame the Heart Nebula (IC 1805)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIC 1805 spans about 2.5 degrees. Full frame at 540mm covers about 3.8 x 2.5 degrees, so it fits; with the Flat6AIII the field grows to about 4.8 x 3.2 degrees.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the FLT91 for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 540mm, planets need short eyepieces or a \u003ca href=\"\/collections\/barlows-and-extenders\"\u003eBarlow\u003c\/a\u003e for high power; a 7mm eyepiece gives about 77x. Long-focus telescopes give larger planetary images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Bahtinov mask?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFit the lens cover with the mask, aim at a bright star, and adjust focus until the central diffraction spike sits centred between the other two.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does the Fluorostar 91 need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual gives 5.575 kg with ring, dovetail and saddle. Add your camera and accessories and choose a mount with a Vixen-style saddle whose rated payload covers the total with margin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach an EAF to the FLT91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual's steps: remove the top screw (2mm Allen key), release the two inner knob screws, remove the knob, align the screw holes, lock the two set screws on the shaft and tighten both bracket screws. With a motor fitted, do not over-tighten the tension screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the 2-inch RotoLock for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is the visual back included in the box: with the visual extension tube, it takes a 2-inch diagonal or a 2-inch to 1.25-inch adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a case included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a soft carry case. William Optics does not state airline suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does f\/5.9 mean for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt f\/5.9 each sub-frame needs roughly half the exposure of an f\/8 system for the same signal. With the Flat6AIII it becomes about f\/4.7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eApochromatic Triplet Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e91mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Glass\u003c\/td\u003e\n\u003ctd\u003eFPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrehl Ratio\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 0.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Rotator\u003c\/td\u003e\n\u003ctd\u003e360°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e2\" Rotolock Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFeatures\u003c\/td\u003e\n\u003ctd\u003eIntegrated Saddle Handle, Built-in Bahtinov Mask\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Tube Only)\u003c\/td\u003e\n\u003ctd\u003e4.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Fully Equipped)\u003c\/td\u003e\n\u003ctd\u003e5.6 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eGrey, Gold, Red\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e540mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage circle \/ fully illuminated field\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;43mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e441mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eLong Vixen-style plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM92 thread (2\" RotoLock included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov mask (lens cover)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e120mm saddle handle bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVisual extension tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" RotoLock visual back adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLong Vixen-style dovetail plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft carry case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William_Optics_Fluorostar_91_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Grey","offer_id":44967782088989,"sku":"WO-T-FLT-91SG-RP33","price":2881.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967782023453,"sku":"WO-T-FLT-91GD-RP33","price":2733.0,"currency_code":"CAD","in_stock":true},{"title":"Red","offer_id":44967782056221,"sku":"WO-T-FLT-91RD-RP33","price":2733.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Williamo-Optics-FLT91-1.jpg?v=1722276083"},{"product_id":"william-optics-fluorostar-120","title":"William Optics Fluorostar 120","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e120mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/6.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eFPL-53 Apochromatic Triplet Optics\u003c\/li\u003e\n\u003cli\u003e3.3-inch Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eImage Circle \u0026gt;43mm\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask Lens Cap\u003c\/li\u003e\n\u003cli\u003eLosmandy-style Type D Dovetail Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 120 Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 120 is a 120mm, 780mm, f\/6.5 apochromatic triplet with FPL-53 glass, designed for the exacting demands of modern astrophotographers. The image circle is greater than 43mm. It has a heavy-duty 3.3-inch rack-and-pinion \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e with a built-in rotator, a Losmandy-type plate and a Bahtinov mask in the lens cover. This page offers red, gold and space grey.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 120mm FPL-53 Triplet\u003c\/h3\u003e\n\u003cp\u003eThe Fluorostar 120's triplet lens system uses FPL-53 glass for superior aberration correction and crystal-clear imaging.\u003c\/p\u003e\n\u003cp\u003eThe manual describes a new lens cell design with FPL-53 glass in the WO triplet series (GT and FLT), designed for temperature compensation to better prevent pinched optics in cold weather.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e780mm at f\/6.5\u003c\/h3\u003e\n\u003cp\u003eA 120mm objective has a Dawes limit of about 0.97 arcseconds. At 780mm a full-frame sensor covers about 2.6 x 1.8 degrees and APS-C (about 23.5 x 15.6mm) about 1.7 x 1.1 degrees. That scale suits galaxies, the brighter parts of nebulae and detailed lunar landscapes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImage Circle\u003c\/h3\u003e\n\u003cp\u003eThe manual gives the image circle as greater than 43mm. A full-frame sensor's \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e is 43.3mm, at the edge of that figure; APS-C sits well inside. For flat stars, use one of the \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflatteners\u003c\/a\u003e in the manual (below).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 3.3-inch Dual-Speed Rack-and-Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThis heavy-duty 3.3-inch rack-and-pinion focuser has a built-in rotator. It is dual speed, with a 10:1 ratio fine knob and cap, a focuser adjusting knob with a thermometer, and a focuser rotation locking screw.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock:\u003c\/strong\u003e do not over-tighten the focuser lock screw, and release it when focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoothness:\u003c\/strong\u003e push (2mm Allen key) and pull (3mm) gear spacing screws, adjusted only when necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF:\u003c\/strong\u003e some of the gear spacing screws can be removed to attach a motor such as an EAF (electronic automatic focuser): remove the top screw (2mm Allen key), release the two inner knob screws, remove the knob, align the screw holes, lock the two set screws on the shaft and tighten both bracket screws. With a motor fitted, do not over-tighten the tension screw.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM92 Threads, Rotator and Visual Backs\u003c\/h3\u003e\n\u003cp\u003eThe focuser ends in an M92 thread. In the box are an M92 rotator, an M92 to 2-inch RotoLock adapter and a 2-inch to 1.25-inch visual back.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera angle rotator:\u003c\/strong\u003e release the camera angle rotation locking screw, turn the camera to frame your target, and lock it again.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch RotoLock:\u003c\/strong\u003e holds a 2-inch diagonal or accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch to 1.25-inch visual back:\u003c\/strong\u003e for 1.25-inch accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptional Flat7A 0.8x and Flat68III 1x\u003c\/h3\u003e\n\u003cp\u003eThe manual shows spot diagrams for two flatteners, neither included:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eP-FLAT68III (1x):\u003c\/strong\u003e keeps 780mm and f\/6.5.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eP-FLAT7A (0.8x):\u003c\/strong\u003e about 624mm and f\/5.2; full frame then covers about 3.3 x 2.2 degrees and each sub-frame needs about 64% of the native exposure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe accessories map runs flattener, T-mount, DSLR or mirrorless camera; or flattener, the adapter that comes with your \u003ca href=\"\/collections\/cameras\"\u003eastronomy camera\u003c\/a\u003e, camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use\u003c\/h3\u003e\n\u003cp\u003eThe accessories map shows a 2-inch RotoLock with a 2-inch diagonal and \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e, or a 2-inch to 1.25-inch adapter with a 1.25-inch diagonal or erecting prism. At 780mm, a 25mm eyepiece gives about 31x and a 7mm about 111x.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDew Shield, Bahtinov Mask, Handle Bar and Plate\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBahtinov mask:\u003c\/strong\u003e in the lens cover; it is patented and made from a material three times lighter than traditional masks. The front cover threads on at M156.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew shield:\u003c\/strong\u003e retractable, 155mm across, with a lock screw.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSaddle handle bar:\u003c\/strong\u003e CNC-anodized aluminium, and a mount for the William Optics UniGuide and other Vixen-type \u003ca href=\"\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e bases; M4 locking screws and M4 and M6 screw holes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e mounting rings with knobs on a Losmandy Style Type D mounting plate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWeight and Length\u003c\/h3\u003e\n\u003cp\u003eThe optical tube weighs 7.105 kg (15.66 lbs), and 9.455 kg (20.84 lbs) with ring, \u003ca href=\"\/collections\/dovetail-plates\"\u003edovetail\u003c\/a\u003e and saddle. Length is 680mm retracted and 850mm extended. A soft carry case is included. Add your camera and compare the total with your mount's rated payload.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCare and Storage\u003c\/h3\u003e\n\u003cp\u003eBefore storing the telescope, leave it uncovered with the tube open long enough to adjust to room temperature, and make sure it is completely dry. Store it in a dry place with a consistent temperature.\u003c\/p\u003e\n\u003cp\u003eNever aim the telescope or finder at the Sun without proper \u003ca href=\"\/collections\/solar-filters\"\u003esolar filters\u003c\/a\u003e installed on the front of the telescope; doing so for even a moment may permanently damage your vision. Solar eyepiece filters are not considered safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mount does the Fluorostar 120 need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt weighs 9.455 kg with ring, dovetail and saddle. Add your camera and accessories and choose a mount with a Losmandy D saddle whose rated payload covers the total with margin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach an EAF to the Fluorostar 120?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual's steps: remove the top screw (2mm Allen key), release the two inner knob screws, remove the knob, align the screw holes, lock the two set screws on the shaft and tighten both bracket screws. With a motor fitted, do not over-tighten the tension screw.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame camera with the Fluorostar 120?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe manual gives an image circle greater than 43mm and a full-frame diagonal is 43.3mm, so full frame is at the edge. Use the Flat68III or Flat7A and ask us about corner coverage for your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the Bahtinov mask?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFit the lens cover with the mask, aim at a bright star, and adjust focus until the central diffraction spike sits centred between the other two.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 120 frame the North America Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNGC 7000 spans about 2 degrees. At 780mm full frame covers about 2.6 x 1.8 degrees, a tight fit; with the Flat7A (about 3.3 x 2.2 degrees) it fits with some room.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I view Jupiter and Saturn with the Fluorostar 120?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, through the visual backs with a diagonal and eyepiece; a 7mm eyepiece gives about 111x. How much detail you see depends on the seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the RotoLock adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe M92 to 2-inch RotoLock adapter in the box. It holds a 2-inch diagonal or accessory on the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need an extension tube for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe accessories map shows an extension tube with the 2-inch RotoLock, but the Fluorostar 120 package list does not include one. Ask us before ordering visual accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the saddle handle bar for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCarrying the telescope, and mounting the William Optics UniGuide or other Vixen-type finder bases.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich colours are offered?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRed, gold and space grey.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Space Gray\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical design\u003c\/td\u003e\n\u003ctd\u003eApochromatic Triplet Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e120mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal length\u003c\/td\u003e\n\u003ctd\u003e780mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage circle \/ fully illuminated field\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;43mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM92 thread (2\" RotoLock and 1.25\" visual back adapters included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e3.3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElements \/ glass\u003c\/td\u003e\n\u003ctd\u003eTriplet, FPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube length (retracted)\u003c\/td\u003e\n\u003ctd\u003e680mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA weight\u003c\/td\u003e\n\u003ctd\u003e7.1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style Type D plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFluorostar 120 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cover with Bahtinov Mask\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSaddle Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLosmandy Style Type D Mounting Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM92 Rotator Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM92 to 2\" RotoLock Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Visual Back Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William_Optics_Fluorostar_120_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967917682973,"sku":"WO-A-F120RD-RP33","price":4717.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967917650205,"sku":"WO-A-F120GD-RP33","price":4717.0,"currency_code":"CAD","in_stock":true},{"title":"Space Gray","offer_id":44967917715741,"sku":"WO-A-F120TG-RP33","price":4717.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT120-1.jpg?v=1722276874"},{"product_id":"askar-fra500-90mm-f-5-6-quintuplet-apo","title":"Askar FRA500 90mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90mm Aperture Quintuplet APO Optics\u003c\/li\u003e\n\u003cli\u003e500mm Focal Length at f\/5.6\u003c\/li\u003e\n\u003cli\u003eMassive 55mm Natively Flat Image Circle\u003c\/li\u003e\n\u003cli\u003eIncludes Two ED Glass Elements\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight of 5.2kg\u003c\/li\u003e\n\u003cli\u003e3.5-inch Dual-Speed 1:10 Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA500 90mm f\/5.6 Quintuplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAskar FRA500 90mm f\/5.6 Quintuplet APO\u003c\/strong\u003e \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e integrates a 90mm aperture with a 500mm focal length into a portable f\/5.6 optical system that is well suited for deep-sky astrophotography. Its five-element APO objective, with two ED glass elements, supports a 55mm image circle, larger than the standard 44mm full-frame circle, without an additional \u003ca href=\"\/products\/askar-2-5-f-3-9-full-frame-reducer-for-fra400-and-fra500\"\u003eflattener\u003c\/a\u003e. The total weight with tube rings and Losmandy-style dovetail plate is 5.2kg.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Askar FRA500: A Portable 90mm f\/5.6 Astrograph\u003c\/h3\u003e\n\u003cp\u003eThe FRA500 fits deep-sky imaging better than the \u003ca href=\"\/products\/askar-fra400-72mm-f-5-6-quintuplet-apo\"\u003eFRA400\u003c\/a\u003e and is lighter and more compact than the \u003ca href=\"\/products\/askar-fra600-108mm-f-5-6-quintuplet-apo\"\u003eFRA600\u003c\/a\u003e, making it a good choice for imaging trips. The 90mm aperture gathers light for faint nebulae and galaxies, and the 500mm focal length suits many popular deep-sky objects.\u003c\/p\u003e\n\u003cp\u003eIt suits APS-C and full-frame sensors, and Askar's back-focus design means no back focus calculation or hunting for spacers: you only need to bring the target into focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet APO Optics with 2 ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe optical system of the FRA500 is a \"3+2\" Petzval-style design, a quintuplet (5-element) air-spaced \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromat\u003c\/a\u003e. It needs no separate field flattener. The front group has three lenses.\u003c\/p\u003e\n\u003cp\u003eWithin this front group are two pieces of extra-low dispersion (ED) glass, which effectively correct chromatic aberration and enhance image sharpness. The rear two-element group, closely spaced, improves field flatness; you may barely detect any blurry star at the edge of the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90mm Aperture \u0026amp; 500mm Focal Length at f\/5.6\u003c\/h3\u003e\n\u003cp\u003eThe combination of a 90mm aperture and 500mm focal length defines the FRA500's role in astrophotography. The 90mm objective gathers light for fainter detail while keeping the telescope's size and weight manageable.\u003c\/p\u003e\n\u003cp\u003eThe f\/5.6 focal ratio strikes a balance between speed and image scale. At 500mm a full-frame sensor covers about 4.1 x 2.7 degrees, enough to frame the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 55mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe FRA500's 55mm image circle is amazing: much larger than the standard 44mm full-frame image circle. You do not need a separate field flattener.\u003c\/p\u003e\n\u003cp\u003eAn image circle of this size offers several key advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-Frame Coverage:\u003c\/strong\u003e It covers the 43.3mm diagonal of a full-frame sensor with margin.\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMargin for Framing:\u003c\/strong\u003e The circle extends past the corners of a full-frame sensor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e158mm and 85mm Connection Distances\u003c\/h3\u003e\n\u003cp\u003eThere are two maximum connection distances to the focal plane. From the base of the M86x1 thread on the \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003erotator\u003c\/a\u003e, it is 158mm; your imaging train, such as an \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e, \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e and camera, sits within it.\u003c\/p\u003e\n\u003cp\u003eFor more straightforward setups, the FRA500 includes a conical adapter that terminates in a standard M48x0.75 thread. From the base of that M48×0.75 thread to the focal plane, the maximum connection is 85mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.5-inch Rack-and-Pinion Focuser with 1:10 Fine Control\u003c\/h3\u003e\n\u003cp\u003eThe FRA500 has a massively built 3.5-inch rack-and-pinion focuser with dual-speed knobs (twin coarse knobs and one 1:10 fine knob). It is tough and solid, with a clearly readable graduation inside.\u003c\/p\u003e\n\u003cp\u003eThe fine knob gives small focus steps, useful with a \u003ca href=\"\/collections\/focusing-masks\"\u003eBahtinov mask\u003c\/a\u003e. The rear of the focuser carries a rotator with an M86x1 thread for framing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Optional 0.7x Reducer for f\/3.9 Imaging\u003c\/h3\u003e\n\u003cp\u003eFor imagers seeking an even wider field of view and faster imaging speeds, the optional Askar F3.9 Full Frame Reducer for the FRA400 and FRA500 is available. It is a 0.7x reducer that brings f\/5.6 down to f\/3.9.\u003c\/p\u003e\n\u003cp\u003eAt f\/3.9 the same exposure takes about 49% of the time needed at f\/5.6. The reducer has a standard 55mm back focus and a built-in M48×0.75 thread for 2-inch filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Train Configuration: M86 and M48 Camera Connections\u003c\/h3\u003e\n\u003cp\u003eThe Askar FRA500 is designed for straightforward camera connection. The connection point on the rotator is an M86x1 thread, from which Askar measures 158mm to the focal plane.\u003c\/p\u003e\n\u003cp\u003eAskar includes a conical extender with an M48x0.75 thread; from its base the maximum connection to the focal plane is 85mm, for a camera with an M48 T-ring or an astronomy camera with a \u003ca href=\"\/collections\/filter-wheels-and-drawers\"\u003efilter drawer\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Build: A 4.1kg OTA with Retractable Dew Shield\u003c\/h3\u003e\n\u003cp\u003eThe optical tube assembly (OTA) itself weighs only 4.1kg, The total length is 452mm with the dew shield stretched out and 407mm with it contracted.\u003c\/p\u003e\n\u003cp\u003eThe main tube and dew shield are milk-white, the focuser is high-gloss piano black, and the dew shield bezel ring and tube rings are bright red. A standard finder base with a silver thumb screw sits on the left side of the focuser for finders, guiders or other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIncluded Components\u003c\/h3\u003e\n\u003cp\u003eThe total weight with tube rings and dovetail plate is 5.2kg. The package includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube Rings:\u003c\/strong\u003e A pair of tube rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarry Handle:\u003c\/strong\u003e A multi-functional handle attached to the top of the rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar Losmandy Dovetail Plate:\u003c\/strong\u003e A Losmandy-style dovetail plate at the bottom of the rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConical Extender:\u003c\/strong\u003e Steps the M86x1 thread down to M48x0.75 for camera connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGetting Started: Your First Night with the FRA500\u003c\/h3\u003e\n\u003cp\u003eSetting up the FRA500 for its first imaging session is straightforward. First, attach the Losmandy dovetail plate to your equatorial mount and securely lock it down. Next, assemble your imaging train (camera, filter holder and guider) within the 85mm or 158mm connection distance. Attach the completed train to the focuser.\u003c\/p\u003e\n\u003cp\u003eBalance the telescope carefully in both Right Ascension and Declination axes on your mount. This is crucial for accurate tracking. After polar aligning your mount, point the telescope to a bright star and use a Bahtinov mask to achieve critical focus with the 1:10 fine focus knob. Once focused, slew to your desired deep-sky target, start your guiding, and begin your imaging sequence. Remember to never look at the Sun through the telescope, as it will cause irreversible damage to your eyes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate field flattener for the Askar FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Askar FRA500 features an integrated quintuplet (5-element) Petzval optical design. Its rear two-element group improves field flatness, so no additional flattener is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of camera sensor is the Askar FRA500's 55mm image circle for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 55mm image circle is larger than the 43.3mm diagonal of a full-frame sensor, so it suits full-frame DSLR, mirrorless and astronomy cameras as well as smaller formats.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar FRA500 frame large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 500mm with a full-frame sensor the field is about 4.1 x 2.7 degrees, enough to frame the Andromeda Galaxy (M31), the North American Nebula (NGC 7000) or the Veil Nebula complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the 85mm and 158mm back focus distances on the FRA500 for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese are the two primary connection options for your imaging train. The \u003cstrong\u003e158mm distance\u003c\/strong\u003e is measured from the large M86x1 thread on the rotator, to the focal plane. The \u003cstrong\u003e85mm distance\u003c\/strong\u003e is measured from the base of the M48x0.75 thread on the included conical extender. Askar's back-focus design means you do not calculate spacing; you bring the target into focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA500 for imaging the Orion Nebula (M42) from a portable setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. At 500mm the Orion Nebula (M42) and the Running Man Nebula fit in one full-frame field, and at 5.2kg with rings and plate the FRA500 suits a portable rig.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar FRA500 suitable for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAskar presents the FRA500 for astrophotography and lists no visual adapters in its package, so check that your diagonal and eyepiece reach focus before relying on it for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the optional 0.7x reducer affect the Askar FRA500's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optional 0.7x reducer transforms the FRA500 into a faster, wider instrument. It brings the focal ratio to f\/3.9, so the same exposure takes about 49% of the time needed at f\/5.6, with a wider field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the 3.5-inch focuser on the FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 3.5-inch focuser is massively built, tough and solid. It has twin coarse knobs and a 1:10 fine knob, and a clearly readable graduation inside.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow compact is the Askar FRA500 for travel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is convenient to carry and suits long-distance trips. With its dew shield retracted, the total length is just 407mm (about 16 inches). The OTA itself weighs 4.1kg (9 lbs), making it relatively easy to pack and transport to a dark-sky location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"APO\" designation mean for the Askar FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"APO\" stands for apochromatic, a refractor designed to bring three wavelengths of light (red, green and blue) to a common focus. The FRA500's two ED glass elements correct chromatic aberration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e90mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet air-spaced APO (including two ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e85mm (from M48x0.75 thread); 158mm (from M86x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Thread\u003c\/td\u003e\n\u003ctd\u003eM86x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConical Adapter\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e452mm (407mm with dew shield contracted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e4.1kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e5.2kg (including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eRack and pinion, dual-speed 1:10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e3.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eAskar Losmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMatching flattener \/ reducer\u003c\/td\u003e\n\u003ctd\u003eAskar F3.9 Full Frame Reducer for FRA400\/FRA500 (0.7x)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFRA500 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings (Pair)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar Losmandy Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eConical Extender (M48x0.75)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967965425949,"sku":"ASK-FRA500","price":2799.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA500__40204.1641245267.1280.1280.jpg?v=1684347331"},{"product_id":"sharpstar-130mm-f-2-8-hnt-hyperbolic-newtonian-astrograph","title":"SharpStar 13028HNT-AL 130mm f\/2.8 Hyperbolic Newtonian Astrograph","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e130mm Hyperbolic Newtonian Optics\u003c\/li\u003e\n\u003cli\u003e364mm Focal Length at f\/2.8\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003e6.9° Field of View\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight: 4.8kg\u003c\/li\u003e\n\u003cli\u003e55mm Standard Back Focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 13028HNT-AL 130mm f\/2.8 Hyperbolic Newtonian Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 13028HNT-AL combines a 130mm hyperbolic primary mirror and a 364mm focal length to achieve its native f\/2.8 optical speed. This \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e illuminates a full 44mm image circle, covering modern full-frame sensors with a vast 6.9-degree field of view and resolving details down to 0.89 arc seconds. Weighing just 4.8kg with its rings and 290mm Vixen-style plate, this imaging instrument delivers its wide-field capability in a compact 400mm tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 130mm f\/2.8 Hyperbolic System with 96% Reflectivity\u003c\/h3\u003e\n\u003cp\u003eAt the core of the 13028HNT-AL is a fast, light-gathering optical system designed for deep-sky imaging. The 130mm hyperbolic primary mirror is made from low-expansion PZ33 glass to maintain focus during temperature shifts. Unlike a standard parabolic \u003ca href=\"\/collections\/newtonian-telescopes\"\u003eNewtonian\u003c\/a\u003e that requires a separate \u003ca href=\"\/collections\/coma-correctors\"\u003ecoma corrector\u003c\/a\u003e, this design integrates a two-element corrector into the \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e assembly to deliver sharp stars across the entire 44mm image circle.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Coatings:\u003c\/strong\u003e Both the primary and 65mm secondary mirrors feature an enhanced aluminum coating, ensuring reflectivity greater than 96% for brighter images and a better signal-to-noise ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eED Glass Corrector:\u003c\/strong\u003e The corrector assembly includes one ED (Extra-low Dispersion) glass element to suppress chromatic aberration, ensuring star colors are rendered accurately without distracting halos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePZ33 Primary Mirror:\u003c\/strong\u003e The Pyrex-like PZ33 mirror material minimizes thermal expansion and contraction, helping the telescope hold focus as ambient temperatures change during an imaging session.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e44mm Corrected Image Circle for 6.9° Full-Frame Views\u003c\/h3\u003e\n\u003cp\u003eThe SharpStar 13028HNT-AL is engineered to fully illuminate a 44mm image circle, making it an ideal match for full-frame DSLR, mirrorless, and dedicated \u003ca href=\"\/collections\/cameras\"\u003eastronomy cameras\u003c\/a\u003e. SharpStar sizes the 65mm secondary mirror to give sufficient illumination for full-frame imaging. This expansive 6.9-degree field of view lets you frame enormous targets like the Andromeda Galaxy (M31) or the entire North American Nebula (NGC 7000) in a single shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 4.8kg All-Metal, CNC-Machined Astrograph\u003c\/h3\u003e\n\u003cp\u003eAn astrograph's mechanical stability is just as critical as its optical design. The 13028HNT-AL is built from all-metal components, featuring a rigid aluminum main tube and CNC-machined parts for the focuser, secondary bracket, and mirror cell. This construction ensures precise, repeatable collimation and minimizes mechanical flexure, even with a heavy imaging payload weighing up to 3kg.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable Secondary Bracket:\u003c\/strong\u003e The integrated, CNC-machined secondary mirror bracket is designed for rigidity, which not only holds collimation but also produces clean, sharp diffraction spikes on bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Point Primary Cell:\u003c\/strong\u003e The primary mirror cell features three sets of locking and adjustment screws for precise collimation, ensuring you can align the optical system for peak performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Build:\u003c\/strong\u003e The optical tube alone weighs just 3.8kg, and the included hollow-design tube rings help keep the total assembled weight to a portable 4.8kg.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3kg Capacity Focuser with 360° Rotator and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe imaging train is managed by a heavy-duty, dual-speed rack-and-pinion focuser designed to carry a payload of up to 3kg. This robust focuser can easily support a full-frame camera, \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e, and \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e without slipping or tilting. An integrated 360° \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003ecamera rotator\u003c\/a\u003e allows you to frame your target perfectly without loosening any other components, while the standard 55mm back focus from the M48x0.75 thread simplifies connecting your camera using standard spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting Hardware: 290mm Vixen Plate, Rings, and Handle\u003c\/h3\u003e\n\u003cp\u003eThe 13028HNT-AL includes a complete set of mounting hardware to get you started right out of the box. The package contains a set of sturdy, hollow-design tube rings, whose enlarged hand screws open and close without tools, and a 290mm Vixen-style dovetail plate for the many \u003ca href=\"\/collections\/equatorial-mounts\"\u003eequatorial mounts\u003c\/a\u003e with a Vixen-style saddle. A handle bar is also included, and a finder base on the side of the tube provides additional mounting positions for a finder scope or other astronomical accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCollimation System: A User-Adjustable Design with Included Tools\u003c\/h3\u003e\n\u003cp\u003eThe astrograph is collimated and fixed at the factory, but transport knocks or cleaning can shift the optical axis, so there is a procedure for users to realign it themselves. The box includes the collimating adapter, collimating eyepiece, 1.25\" adapter, locking ring removal tool and T8 Torx wrench; the mirror adjustment and locking screws take 3mm and 4mm Allen wrenches, which are not in the box list. The secondary mirror sits in a rigid, integrated CNC-machined holder whose angle and height are locked before shipping, so only its tilt needs adjusting, while the primary mirror has three sets of adjustment and locking screws. The corrector comes out of the focuser before collimation, and a final star test with the corrector refitted confirms the result, so you can reach the telescope's theoretical 0.89 arc second resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSharpStar 13028HNT-AL vs. 130mm APO Refractors: The f\/2.8 Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a 130mm \u003ca href=\"\/collections\/apochromatic-refractors\"\u003eapochromatic refractor\u003c\/a\u003e offers a maintenance-free, sealed optical tube, the SharpStar 13028HNT-AL provides a decisive advantage in speed and field of view. A typical 130mm APO has a focal ratio around f\/7, whereas the 13028HNT-AL operates at a native f\/2.8.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExposure Time:\u003c\/strong\u003e The f\/2.8 system gathers light over six times faster than an f\/7 system. A 1-minute exposure on the 13028HNT-AL collects the same amount of signal as a 6-minute exposure on the refractor, allowing you to complete projects in a fraction of the time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of View:\u003c\/strong\u003e With its 364mm focal length, the 13028HNT-AL delivers a much wider field of view than a 130mm refractor, which typically has a focal length over 900mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Trade-off:\u003c\/strong\u003e The Newtonian design requires periodic collimation to maintain peak optical alignment, a step not needed with a refractor. However, for imagers prioritizing speed and field of view, this is a manageable trade-off for the dramatic reduction in exposure time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the SharpStar 13028HNT-AL's f\/2.8 speed so important for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn f\/2.8 focal ratio dramatically reduces the exposure time needed to capture faint deep-sky objects. Compared to a more common f\/5.6 instrument, it gathers light four times faster. This means you can capture more data in a single night, improve your signal-to-noise ratio, and place less demand on your tracking mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SharpStar 13028HNT-AL's 44mm image circle perform on large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 44mm image circle is designed for full-frame sensors. Combined with the 364mm focal length, this provides a massive 6.9-degree field of view. This is wide enough to capture the entire Andromeda Galaxy (M31) and its satellite galaxies, M32 and M110, with plenty of surrounding space, making it ideal for large-scale mosaics and framing the biggest nebulae like the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to collimate the SharpStar 13028HNT-AL, and are tools included?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, from time to time. The 13028HNT-AL is collimated at the factory, but transport knocks or cleaning can shift the optical axis. SharpStar includes a collimating eyepiece, a collimating adapter, a 1.25\" adapter, a locking ring removal tool and a T8 Torx wrench; the mirror screws themselves take 3mm and 4mm Allen wrenches, which are not in the box list. The process is straightforward and essential for achieving the telescope's specified 0.89 arc second resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the 3kg focuser capacity of the SharpStar 13028HNT-AL handle my imaging setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 3kg payload capacity of the dual-speed rack-and-pinion focuser is specifically designed for modern imaging setups. A typical full-frame cooled CMOS camera, 7-position filter wheel, and an off-axis guider will fall well within this limit, preventing focuser sag or tilt during long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the 55mm back focus on the SharpStar 13028HNT-AL, and why does it matter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 55mm back focus is the standardized distance required between the focuser's M48x0.75 thread and your camera's sensor for the optical corrector to work properly. This industry standard is used by most DSLRs (with a T-ring) and dedicated astronomy cameras, making it easy to achieve the correct spacing with off-the-shelf adapters and extension tubes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the benefits of the PZ33 primary mirror in the SharpStar 13028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePZ33 is a borosilicate glass similar to Pyrex, with a very low coefficient of thermal expansion. This means as the temperature drops overnight, the mirror's shape remains stable, preventing the focus from shifting. This is a critical feature for maintaining sharp stars over a long imaging session without constant refocusing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the SharpStar 13028HNT-AL require a separate coma corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The hyperbolic primary mirror is part of an optical system that includes a built-in two-element corrector located inside the focuser. This integrated design corrects for coma and other aberrations across the 44mm image circle, so no external coma corrector is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the SharpStar 13028HNT-AL?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of 4.8kg including its rings, dovetail plate and handle bar, the 13028HNT-AL suits a wide range of mid-sized equatorial mounts. Add the weight of your camera, filter wheel and guiding gear, and choose a mount whose imaging payload rating leaves comfortable headroom above that total for stable tracking and guiding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 50% central obstruction of the SharpStar 13028HNT-AL mean for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 50% central obstruction (from the 65mm secondary mirror) is a necessary design element to fully illuminate a 44mm full-frame sensor at such a fast f\/2.8 focal ratio. While a large obstruction reduces contrast slightly, this is a standard trade-off for fast, wide-field Newtonian astrographs; flat frames, as with any imaging telescope, take care of any uneven illumination across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 360° rotator on the SharpStar 13028HNT-AL focuser work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe integrated 360° rotator allows you to change the orientation of your camera without loosening it from the focuser. You simply loosen the rotator's locking screw, turn your entire imaging train to the desired composition angle, and then tighten the screw. This makes framing targets quick and precise. SharpStar ships the focuser and rotator locked, so loosen the locking screws before first use to avoid damaging them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Size\u003c\/td\u003e\n\u003ctd\u003e130mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e364mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField of View\u003c\/td\u003e\n\u003ctd\u003e6.9°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.89 arc second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Visual Magnitude\u003c\/td\u003e\n\u003ctd\u003e12.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Type\u003c\/td\u003e\n\u003ctd\u003eHyperbolic reflective mirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Material\u003c\/td\u003e\n\u003ctd\u003ePZ33 (similar to Pyrex glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Minor Axis\u003c\/td\u003e\n\u003ctd\u003e65mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector\u003c\/td\u003e\n\u003ctd\u003eTwo-element air-spaced refractive lenses (one ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e174mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Length\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e3.8kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (with Rings \u0026amp; Plate)\u003c\/td\u003e\n\u003ctd\u003e4.8kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eDual-speed rack and pinion, with 360° camera rotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser travel\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e3kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear \/ camera-side connection\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003e290mm Vixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction\u003c\/td\u003e\n\u003ctd\u003e50% (65mm secondary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNewtonian reflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e13028HNT-AL optical tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube rings (set)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e290mm Vixen-style dovetail plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCollimating adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCollimating eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLocking ring removal tool\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eT8 Torx wrench\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWarranty card\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar_13028HNT-AL_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44968028766493,"sku":"SSO-13028HNT-AL","price":2303.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SSO-13028HNT-AL.jpg?v=1755111542"},{"product_id":"askar-fra300-60mm-f-5-quintuplet-apo","title":"Askar FRA300 Pro 60mm f\/5 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e60mm Quintuplet APO Astrograph\u003c\/li\u003e\n\u003cli\u003e300mm Focal Length at a Fast f\/5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eIntegrated Petzval Corrector Design\u003c\/li\u003e\n\u003cli\u003e2.5\" Dual-Speed Rack-and-Pinion Focuser with 360° Rotator\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight: 3.12kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA300 Pro 60mm f\/5 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA300 Pro delivers a fast f\/5 focal ratio from its 60mm quintuplet APO optical system, designed for portable wide-field astrophotography. Its 300mm focal length supports a 44mm full-frame image circle without a separate \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflattener\u003c\/a\u003e. The entire optical tube is just 303mm long and weighs 2.26kg, with a total assembled weight of 3.12kg including its Vixen-style dovetail and tube ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe FRA300 Pro: A 60mm Astrograph for Portable Imaging\u003c\/h3\u003e\n\u003cp\u003eThe FRA300 Pro is the first of the Askar Pro series and the brand's smallest-aperture, fastest-native-focal-ratio Petzval \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e to date. The 60mm aperture and 300mm focal length suit large nebulae, the Andromeda Galaxy (M31) and rich star fields.\u003c\/p\u003e\n\u003cp\u003eThe f\/5 focal ratio effectively reduces exposure time, and with the compact tube and 2.5-inch geared \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e it is the portable choice for field photographers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet Petzval Optics: One ED Element for Apochromatic Stars\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the FRA300 Pro is a five-element, fully air-spaced optical design. This quintuplet layout, which includes one ED (Extra-low Dispersion) glass element, is fully multi-coated to remove stray light. The central star-point RMS radius is less than 2 micrometers.\u003c\/p\u003e\n\u003cp\u003eThe rear group uses two far-separated lenses, which improves star quality and aberration correction and gives very good control of full-frame peripheral light fall-off. With the native Petzval design there is no separate flattener to choose and space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e300mm at f\/5: Capturing Wide-Field Data in Less Time\u003c\/h3\u003e\n\u003cp\u003eAt 300mm a full-frame camera covers about 6.8 x 4.6 degrees, enough to frame the North America Nebula (NGC 7000) or the Veil Nebula complex in one shot.\u003c\/p\u003e\n\u003cp\u003eCompared with f\/6 or f\/7, f\/5 helps you get the same exposure in less time: about 69% of the time needed at f\/6 and 51% at f\/7.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Flat 44mm Image Circle, No Flattener Required\u003c\/h3\u003e\n\u003cp\u003eThe Askar FRA300 Pro supports a 44mm image circle, which is compatible with most cameras on the market, up to full-frame format (36x24mm).\u003c\/p\u003e\n\u003cp\u003eBecause the Petzval design has the field flattener built-in, you do not need to purchase or calculate the spacing for an external corrector. As long as the focus is within a certain range, it is at the optimal position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eConnection Distances up to 71mm\u003c\/h3\u003e\n\u003cp\u003eWith the focuser fully retracted, the maximum connection distance is up to 71mm from the M42 and M54 threads, and up to 67mm from the M48 thread. Plan the optical length of \u003ca href=\"\/collections\/filter-wheels-and-drawers\"\u003efilter drawers\u003c\/a\u003e or an \u003ca href=\"\/collections\/autoguiding\"\u003eoff-axis guider\u003c\/a\u003e within these figures.\u003c\/p\u003e\n\u003cp\u003eThe focuser is equipped with a universal M48x0.75 male thread adapter with a built-in 2-inch filter thread, and Askar includes separate M54x0.75 and M42x0.75 adapters for a variety of imaging equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 2.5\" Focuser: Dual-Speed Control with a 360° Rotator\u003c\/h3\u003e\n\u003cp\u003eThe FRA300 Pro has a 2.5-inch rack-and-pinion focuser that is solid and beautiful, with twin coarse knobs and a fine adjustment knob.\u003c\/p\u003e\n\u003cp\u003eA 360° \u003ca href=\"\/collections\/rotators-and-tilt-adjusters\"\u003erotator\u003c\/a\u003e is integrated into the rear of the focuser. It lets you rotate to any angle when shooting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Train Integration: Pairing Cameras with the FRA300 Pro\u003c\/h3\u003e\n\u003cp\u003eThe M48 thread and the included M42 and M54 adapters cover common camera connections.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor Compatibility:\u003c\/strong\u003e The 44mm image circle covers full-frame sensors, and smaller APS-C and Micro Four Thirds sensors use its central part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Integration:\u003c\/strong\u003e The M48 thread at the rear of the focuser has a built-in 2-inch filter thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding:\u003c\/strong\u003e The multi-functional handle can take a universal Vixen-style finder base, for example for a guide scope; an off-axis guider (OAG) must fit within the connection distance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Design: A 303mm Tube with CNC-Machined Hardware\u003c\/h3\u003e\n\u003cp\u003eThe Askar FRA300 Pro is assembled from CNC-machined components with a smooth spray coating and light oxidation. The \u003ca href=\"\/collections\/optical-tubes\"\u003eoptical tube assembly\u003c\/a\u003e is 303mm long.\u003c\/p\u003e\n\u003cp\u003eThe single tube ring is lightweight, the multi-functional handle can take a Vixen-style finder base, and the 300mm Vixen-style dovetail plate lets the astrograph keep its balance on the mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready at 3.12kg: Portability and Included Components\u003c\/h3\u003e\n\u003cp\u003eWith a bare optical tube weight of just 2.26kg and a total weight of 3.12kg with the tube ring and dovetail plate, the FRA300 Pro is easy to take far from city lights.\u003c\/p\u003e\n\u003cp\u003eThe package includes a tube ring, a multi-function handle, a 300mm Vixen-style dovetail plate, and both M54 and M42 camera adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Petzval design of the Askar FRA300 Pro mean for my imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Petzval design means the field-flattening optical elements are built directly into the main telescope tube. There is no separate flattener to buy and no back focus to calculate: as long as the focus is within a certain range, it is at the optimal position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the FRA300 Pro frame large targets like the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 300mm focal length, the Askar FRA300 Pro suits large targets like the Andromeda Galaxy (M31). On a full-frame sensor (36x24mm) the field is about 6.8° x 4.6°, wide enough for the whole galaxy with M32 and M110.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the f\/5 focal ratio on the FRA300 Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe fast f\/5 focal ratio allows the telescope to collect the same amount of light in a shorter period compared to slower f\/6 or f\/7 systems. This helps you get the same exposure in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 60mm aperture of the FRA300 Pro enough for faint deep-sky objects like the North America Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. For faint, extended objects like the North America Nebula (NGC 7000), the f\/5 focal ratio matters more than aperture, and at 300mm the whole nebula fits a full-frame field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA300 Pro for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAskar presents the FRA300 Pro as an astrograph and lists no visual adapters in its package, so check that your \u003ca href=\"\/collections\/diagonals\"\u003ediagonal\u003c\/a\u003e and \u003ca href=\"\/collections\/eyepieces\"\u003eeyepiece\u003c\/a\u003e reach focus before relying on it for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to calculate back focus for the Askar FRA300 Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. With the native Petzval design, as long as the focus is within a certain range, it is at the optimal position. With the focuser fully retracted, the maximum connection is 67mm from the M48 thread or 71mm from the M42 and M54 threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat cameras are compatible with the FRA300 Pro's 44mm image circle?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 44mm image circle supports sensors up to and including full-frame (36x24mm) format. It is compatible with most cameras on the market, using the M48, M42 or M54 connection. Smaller APS-C and Micro Four Thirds sensors also fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a filter to the FRA300 Pro imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe rear M48x0.75 male thread has a built-in 2-inch filter thread. This allows you to screw a standard 2\" filter directly onto the telescope's connection point before attaching your camera adapter. Alternatively, you can use a filter drawer or \u003ca href=\"\/collections\/filter-wheels\"\u003efilter wheel\u003c\/a\u003e placed between the telescope and the camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the 360° rotator on the FRA300 Pro's focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 360° rotator lets you turn the camera to any angle when shooting, to frame your target or to find a guide star with an off-axis guider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eQuintuplet fully air-spaced Petzval APO (with one ED glass element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm (Full-Frame)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus \/ Working Distance\u003c\/td\u003e\n\u003ctd\u003e71mm from M42×0.75 male thread 67mm from M48×0.75 male thread 71mm from M54×1 male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread (Focuser)\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e303mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.26kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e3.12kg (Including tube ring \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eRack and pinion, dual-speed, 360° rotator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e2.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eAskar 300mm Vixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003etube ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ehandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 300mm Vixen dovetail plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54x0.75 adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM42x0.75 adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ewarranty card\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003emanual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968028897565,"sku":"ASK-FRA300","price":1329.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA300-Pro-1__97100.1656532375.1280.1280.jpg?v=1684348071"},{"product_id":"askar-107phq-f-7-quadruplet-apo","title":"Askar 107PHQ f\/7 Quadruplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e107mm Aperture Quadruplet APO Optical Design\u003c\/li\u003e\n\u003cli\u003e749mm Focal Length at f\/7\u003c\/li\u003e\n\u003cli\u003e44mm Corrected Image Circle for Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated Field Flattener for Simplified Imaging\u003c\/li\u003e\n\u003cli\u003e3.4-inch Focuser with 8kg Load Capacity\u003c\/li\u003e\n\u003cli\u003e6.9kg Total Weight with Rings and Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 107PHQ f\/7 Quadruplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar 107PHQ f\/7 Quadruplet APO has a built-in flatfield lens and supports a 44mm full-frame image circle with no separate \u003ca href=\"\/collections\/flatteners-and-reducers\"\u003eflattener\u003c\/a\u003e or back focus calculation. It is Askar's first long-focal-ratio self-flat-field \u003ca href=\"\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e, a versatile all-rounder. The 749mm focal length and an air-spaced objective with two ED glass elements are joined by a 3.4-inch \u003ca href=\"\/collections\/focusers\"\u003efocuser\u003c\/a\u003e rated for an 8kg load; the total weight with rings and 300mm Vixen-style dovetail is 6.9kg.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 107mm Quadruplet APO with Two ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe 107PHQ is built around a quadruplet air-spaced apochromatic objective lens system. This four-element design includes two pieces of extra-low dispersion (ED) glass, which better reduce chromatic aberration.\u003c\/p\u003e\n\u003cp\u003eIt achieves excellent color correction even at magnifications up to 300x in visual observation, with a central RMS radius of 3um.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Flat 44mm Image Circle, No Flattener Needed\u003c\/h3\u003e\n\u003cp\u003eThe 107PHQ has a built-in flatfield lens and supports 44mm full-frame imaging. The stars around the corners seldom suffer from distortion or deformation, and it effectively handles field curvature and vignetting.\u003c\/p\u003e\n\u003cp\u003eThere is no separate flattener to buy and no back focus to calculate: attach any imaging accessory directly and, once focused, it is ready for shooting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e749mm Focal Length at f\/7 for Detailed Imaging\u003c\/h3\u003e\n\u003cp\u003eAt 749mm a full-frame sensor covers about 2.8 x 1.8 degrees: enough for the Triangulum Galaxy (M33) or the core of the North American Nebula (NGC 7000), and the bright body of the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003cp\u003eAskar adds that with a high-resolution camera it brings out a lot of detail in the target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 3.4-inch Rack-and-Pinion Focuser with 8kg Capacity\u003c\/h3\u003e\n\u003cp\u003eThe Askar 107PHQ has a 3.4-inch rigid rack-and-pinion focuser that can handle a load of 8kg and is optimized especially for astrophotography.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1:10 Fine Adjustment:\u003c\/strong\u003e For precise focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e95mm Focuser Travel:\u003c\/strong\u003e The long 95mm travel suits visual observation.\u003c\/li\u003e\n\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM86 Down to M48: A Complete Imaging Adapter Set\u003c\/h3\u003e\n\u003cp\u003eThe 107PHQ includes a four-piece M86-M48 photographic adapter set. Askar measures connection distances from the base of the M86x1 male thread.\u003c\/p\u003e\n\u003cp\u003eThe included adapters step this down to common astronomy sizes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM86×1 to M68×1:\u003c\/strong\u003e Up to 119mm from the base of the M68x1 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM68×1 to M54×0.75:\u003c\/strong\u003e Up to 99mm from the base of the M54x0.75 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM54×0.75 to M52×0.75:\u003c\/strong\u003e The third step.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM52×0.75 to M48×0.75:\u003c\/strong\u003e Up to 79mm from the base of the M48x0.75 male thread, with an M48×0.75 filter thread.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptional 0.7x Reducer\u003c\/h3\u003e\n\u003cp\u003eFor imagers seeking a wider field of view and faster imaging times, Askar makes an optional 3-inch 0.7x full-frame reducer for the 107PHQ, \u003ca href=\"\/products\/askar-130phq-f-7-quadruplet-apo\"\u003e130PHQ\u003c\/a\u003e and \u003ca href=\"\/products\/askar-151phq\"\u003e151PHQ\u003c\/a\u003e, a triplet with one ED glass.\u003c\/p\u003e\n\u003cp\u003eIt shortens exposure time and increases the field of view. It supports a 44mm image circle, has a standard 55mm back focus and an 80mm maximum outer diameter, and comes with M68, M54 and M48 thread adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 6.9kg Platform with a 300mm Vixen Plate\u003c\/h3\u003e\n\u003cp\u003eThe Askar 107PHQ weighs 5.7kg for the optical tube alone and 6.9kg fully equipped with its included tube rings, carry handle, and 300mm Vixen-style dovetail plate. \u003c\/p\u003e\n\u003cp\u003eWith the 2-inch \u003ca href=\"\/collections\/visual-adapters\"\u003eeyepiece holder\u003c\/a\u003e, the retractable \u003ca href=\"\/collections\/dew-prevention-and-control\"\u003edew shield\u003c\/a\u003e gives 603mm retracted and 754mm stretched. The CNC-machined tube has a smooth coating with bright green decorative rings and knobs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVisual Use: A High-Contrast 107mm APO for Planets and More\u003c\/h3\u003e\n\u003cp\u003eThe 107PHQ is a nice choice for visual observation: it fits 1.25-inch and 2-inch \u003ca href=\"\/collections\/diagonals\"\u003ediagonals\u003c\/a\u003e and various \u003ca href=\"\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e and reaches focus. It can even be used to observe planets with a super-high magnification eyepiece.\u003c\/p\u003e\n\u003cp\u003eWith a 2-inch diagonal you get wide views of open clusters and nebulae; at higher power, Jupiter's cloud bands, Saturn's rings and lunar craters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar 107PHQ fully illuminate my full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The Askar 107PHQ supports a \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, larger than the 43.3mm diagonal of a full-frame sensor; corner stars seldom suffer from distortion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 107PHQ perform on a target like the Triangulum Galaxy (M33)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e749mm focal length\u003c\/strong\u003e of the Askar 107PHQ suits M33. A full-frame sensor covers about 2.8 x 1.8 degrees and an APS-C sensor about 1.8 x 1.2 degrees, both enough for the galaxy's 1 degree span with its brighter HII regions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 107PHQ suitable for visual observation of planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e It can even be used to observe planets with a super-high magnification eyepiece and keeps excellent color correction up to 300x. It fits 1.25-inch and 2-inch diagonals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters do I need to connect my DSLR to the Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 107PHQ includes a set of adapters that terminates in a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. Add an M48 T-ring for your camera's lens mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to calculate back focus for the Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Attach the imaging accessory directly and, once focused, it is ready for shooting. Stay within the maximum connection distances (for example 79mm from the base of the M48x0.75 male thread with the focuser fully retracted).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the optional 0.7x reducer for the 107PHQ change its performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optional 0.7x reducer transforms the telescope into a faster, wider instrument. Its figures:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduction:\u003c\/strong\u003e 0.7x, triplet with one ED glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e standard 55mm, with a 44mm image circle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt shortens exposure time and increases the field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the benefits of the 3.4-inch focuser on the 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large \u003cstrong\u003e3.4-inch rack-and-pinion focuser\u003c\/strong\u003e provides a very rigid and stable platform for heavy imaging equipment. It is rated for an \u003cstrong\u003e8kg load\u003c\/strong\u003e, with a 1:10 fine adjustment and a long 95mm travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The final adapter in the included four-piece set (M52 to M48) has an \u003cstrong\u003eM48×0.75 filter thread\u003c\/strong\u003e for 2-inch filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 107PHQ portable enough for field use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With a retracted length of \u003cstrong\u003e603mm\u003c\/strong\u003e and a total equipped weight of \u003cstrong\u003e6.9kg\u003c\/strong\u003e, the 107PHQ is manageable to transport to a dark sky site.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I attach a guide scope to the Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. There is a multi-functional handle on top of the tube rings, a common place to attach a small \u003ca href=\"\/collections\/autoguiding\"\u003eguide scope\u003c\/a\u003e for autoguiding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e107mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e749mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuadruplet air-spaced APO (with two ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e603mm (dew shield contracted), 754mm (dew shield extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e5.7kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e6.9kg (Including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread Adapters\u003c\/td\u003e\n\u003ctd\u003eM86×1 to M68×1, M68×1 to M54×0.75, M54×0.75 to M52×0.75, M52×0.75 to M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Adapter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (with M48 filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapters\u003c\/td\u003e\n\u003ctd\u003eFour-piece photographic adapter set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Contents\u003c\/td\u003e\n\u003ctd\u003eA 107PHQ OTA, a pair of tube rings, a handle, an Askar 300mm Vixen dovetail plate, a set of four-piece photographic adapters, a manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser type\u003c\/td\u003e\n\u003ctd\u003eRack and pinion, 1:10 fine adjustment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser \/ drawtube size\u003c\/td\u003e\n\u003ctd\u003e3.4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser travel\u003c\/td\u003e\n\u003ctd\u003e95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser load capacity\u003c\/td\u003e\n\u003ctd\u003e8kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail included\u003c\/td\u003e\n\u003ctd\u003eAskar 300mm Vixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 107PHQ OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings (Pair)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e300mm Vixen-Style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFour-Piece Photographic Adapter Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968035516701,"sku":"ASK-107PHQ","price":3219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-107PHQ-1__20124.1657565714.1280.1280.jpg?v=1684348151"}],"url":"https:\/\/davidastro.com\/collections\/optical-tubes.oembed?page=9","provider":"David Astro","version":"1.0","type":"link"}