{"title":"iOptron Photron Ritchey-Chretien Telescopes","description":"\u003cp\u003eiOptron Photron telescopes are Ritchey-Chretien reflectors, a two-mirror design free of coma that is widely used in research observatories and for deep-sky imaging. The range covers 6\", 8\", 10\", 12\", 14\" and 16\" apertures, including an RC10 with a 3\" focuser.\u003c\/p\u003e\u003cp\u003eTheir long focal lengths give a large image scale for galaxies, planetary nebulae and globular clusters. A field flattener helps on larger sensors.\u003c\/p\u003e","products":[{"product_id":"ioptron-photron-8-ritchey-chretien","title":"iOptron Photron 8\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e200mm (8\") Ritchey-Chretien Optical Design\u003c\/li\u003e\n\u003cli\u003e1624mm Focal Length at f\/8\u003c\/li\u003e\n\u003cli\u003eComa-Free Optics for Flat-Field Astrophotography\u003c\/li\u003e\n\u003cli\u003e2\" 10:1 Dual-Speed Crayford Focuser\u003c\/li\u003e\n\u003cli\u003eLosmandy-style Bottom Dovetail and Vixen-style Top Accessory Rail\u003c\/li\u003e\n\u003cli\u003eWeighs 18 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\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\u003eiOptron Photron 8\" f\/8 Ritchey-Chretien Telescope\u003c\/h2\u003e\n\u003cp\u003eThe iOptron Photron 8\" Ritchey-Chretien delivers a pure, coma-free imaging field with its 200mm hyperbolic primary mirror and 1624mm focal length. Its native f\/8 optical system is purpose-built for astrophotography, achieving a theoretical resolving power of 0.58 arc seconds. The entire optical tube assembly weighs only 18 lbs, making it a powerful imaging instrument for a wide range of equatorial 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\u003eComa-Free Imaging: The 200mm f\/8 Ritchey-Chretien Advantage\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chretien (RC) is the design of choice for professional observatories, and the Photron 8\" brings that optical pedigree to your backyard. Unlike Newtonians that suffer from coma or Schmidt-Cassegrains that require correctors for field curvature, the RC's hyperbolic mirrors produce naturally sharp stars across the entire field of view. This makes it ideal for cameras with APS-C or larger sensors.\u003c\/p\u003e\n\u003cp\u003eAt a focal length of 1624mm, this telescope provides the ideal image scale for capturing details in medium-sized galaxies like the Whirlpool Galaxy (M51) or resolving individual stars in globular clusters like the Great Cluster in Hercules (M13). The open-tube design also eliminates the front corrector plate, allowing for faster thermal acclimation and preventing dew formation on the primary optics.\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: 10:1 Focuser and Dual Dovetails\u003c\/h3\u003e\n\u003cp\u003eTo complement its optics, the Photron 8\" RC is equipped with hardware designed for the demands of imaging. A robust 2\" Crayford focuser with a 10:1 dual-speed knob enables the precise, minute adjustments necessary to achieve critical focus. The focuser includes a 2\" to 1.25\" adapter and a set of extension tubes (two 1\" and one 2\") to correctly position your camera at the focal plane.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Dovetail Bars:\u003c\/strong\u003e A Losmandy-style \"D\" plate provides a secure, wide mounting surface on your primary mount, while a Vixen-style \"V\" bar on top is ready for guide scopes, finder scopes, or other accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtension Tubes Included:\u003c\/strong\u003e The package includes two 1\" and one 2\" extension tubes, giving you the flexibility to reach focus with DSLRs, dedicated astronomy cameras, and various filter wheel or off-axis guider combinations.\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\u003eRigid Steel Tube Construction at 18 lbs\u003c\/h3\u003e\n\u003cp\u003eThe Photron RC's optical tube is constructed from steel, providing excellent rigidity to maintain collimation as the telescope moves across the sky. This thermal stability helps keep focus sharp during temperature drops over a long imaging session. The entire assembly weighs just 18 lbs and has a length of 22.0 inches, placing it well within the capacity of popular mid-range equatorial 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\u003ePhotron 8\" RC vs. a Standard 8\" SCT: An Imager's Choice\u003c\/h3\u003e\n\u003cp\u003eFor astronomers deciding on an 8-inch class telescope, the choice often comes down to an RC like the Photron or a Schmidt-Cassegrain (SCT). While both are powerful, they are optimized for different tasks.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSCT Advantage:\u003c\/strong\u003e A standard 8\" SCT is typically more compact and often serves better as a dual-purpose visual and imaging instrument due to its smaller secondary obstruction and sealed tube. It operates at a slower focal ratio, around f\/10, which can be forgiving for visual use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhotron RC Advantage:\u003c\/strong\u003e The RC is an imaging specialist. Its f\/8 optics are faster, and the field is inherently flat and free of coma without needing an extra corrector lens. The lack of a corrector plate means faster cooldown and one less surface to attract dew, simplifying your imaging workflow.\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 equatorial mount is needed for the iOptron Photron 8\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Photron 8\" RC OTA weighs \u003cstrong\u003e18 lbs\u003c\/strong\u003e. For stable astrophotography, you should choose a mount that can handle at least 1.5 to 2 times the OTA weight once you add a camera, guide scope, and accessories. A mount in the 30-40 lb payload capacity class, such as an iOptron GEM28\/CEM26 or larger, is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Photron 8\" RC perform on small galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1624mm focal length\u003c\/strong\u003e is excellent for imaging galaxies. Paired with a modern astronomy camera with small pixels (e.g., 2.9µm - 3.76µm), the Photron 8\" RC will frame targets like M51 or the Sombrero Galaxy (M104) perfectly, with enough image scale to resolve spiral arms and dust lanes from a dark sky site.\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 extension tubes with the Photron 8\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRitchey-Chretien telescopes have a long back focus distance to accommodate various imaging accessories. You will need to use the included \u003cstrong\u003e1\" and 2\" extension tubes\u003c\/strong\u003e between the focuser and your camera to reach focus. Start by adding the 2\" extension, and then add or remove the 1\" extensions until you are close to focus with the focuser racked about halfway out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Photron 8\" RC a good telescope for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can use it for visual observing, the Photron 8\" RC is optimized for imaging. It has a large secondary mirror (\u003cstrong\u003e95mm\u003c\/strong\u003e) which creates a significant central obstruction. This reduces contrast on planets compared to a dedicated planetary scope like a Maksutov-Cassegrain. However, it can still provide pleasing views of deep-sky objects.\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 or coma corrector with the iOptron Photron 8\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The primary advantage of the \u003cstrong\u003eRitchey-Chretien optical design\u003c\/strong\u003e is that it is inherently corrected for coma and produces a flat field without any additional lenses. You can connect your camera directly to the telescope (using the required extension tubes) and get sharp stars across the frame.\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 Vixen-style bar on top of the Photron 8\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe top-mounted \u003cstrong\u003eVixen-style dovetail bar\u003c\/strong\u003e is an accessory rail. It is not intended for mounting the main telescope. Its purpose is to provide a convenient and sturdy platform for attaching accessories like a guide scope, a heavy-duty finderscope, or a piggyback camera mount.\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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e200mm (8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1624mm\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\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003e0.58 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e236X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd\u003e95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2” 10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Dovetail (Bottom)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Rail (Top)\u003c\/td\u003e\n\u003ctd\u003eVixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope Base\u003c\/td\u003e\n\u003ctd\u003eYes (Finderscope optional)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003e2” to 1.25” adapter, 2x 1\" extension tubes, 1x 2\" extension tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e22.0” (559mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e18 lbs (8.2 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e25 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e27 x 14 x 14 in\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968071430429,"sku":"IOP-6112","price":1649.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/iOptron-Photron-8__65470.1673470512.1280.1280.jpg?v=1684348671"},{"product_id":"ioptron-photron-6-ritchey-chretien","title":"iOptron Photron 6\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e150mm (6\") Ritchey-Chretien Optical Design\u003c\/li\u003e\n\u003cli\u003e1370mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/9 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e10:1 Dual-Speed 2\" Crayford Focuser\u003c\/li\u003e\n\u003cli\u003e12 lbs 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\u003eiOptron Photron 6\" f\/9 Ritchey-Chretien OTA\u003c\/h2\u003e\n\u003cp\u003eThe iOptron Photron 6\" Ritchey-Chretien combines a 150mm coma-free optical system with a 1370mm focal length, delivering sharp, flat-field images ideal for modern astrophotography. Its optical system achieves a resolving power of 0.76 arc seconds, while the entire tube weighs only 12 lbs and measures 19.1\" long, making it a perfect match for a wide range of equatorial mounts. Focusing is managed by a 2\" 10:1 dual-speed Crayford focuser, ensuring you can achieve the critical sharpness required 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\u003eThe 150mm f\/9 Coma-Free Ritchey-Chretien Design\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chretien (RC) design is renowned for its excellent off-axis correction, producing round, pinpoint stars across the entire field without the need for an additional coma corrector. The Photron's 150mm aperture and 1370mm focal length create an f\/9 system that is perfectly suited for imaging smaller deep-sky objects like planetary nebulae and galaxies at high resolution. With a theoretical resolving power of 0.76 arc seconds, you can capture fine details in galactic dust lanes and planetary cloud bands.\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 10:1 Dual-Speed Crayford for Precision Focus\u003c\/h3\u003e\n\u003cp\u003eAchieving perfect focus is critical, and the Photron 6\" RC includes a robust 2\" Crayford focuser with a 10:1 dual-speed mechanism for fine adjustments. This allows for smooth, backlash-free operation, preventing image shift during critical focusing. To accommodate a wide range of cameras and accessories, the package includes two 1\" extension tubes, one 2\" extension tube, and a 2\" to 1.25\" adapter, giving you the flexibility to reach focus with nearly any 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\u003eA Portable 12 lb Imaging Platform for Smaller Mounts\u003c\/h3\u003e\n\u003cp\u003eWeighing just 12 lbs and measuring 19.1\" in length, the Photron 6\" RC is an exceptionally portable imaging instrument. Its low weight and compact size mean it doesn't require a massive, expensive mount to perform well, making it an accessible entry point into high-resolution astrophotography. The included Vixen-style dovetail bar ensures compatibility with a vast number of popular German Equatorial Mounts, allowing for a quick and secure setup.\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\u003ePhotron 6\" RC vs. 6\" SCT: Field Flatness and Focal Ratio\u003c\/h3\u003e\n\u003cp\u003eWhile a 6\" Schmidt-Cassegrain Telescope (SCT) offers a more compact tube and the potential for faster imaging with a reducer, it requires additional correctors to produce a flat, coma-free field suitable for astrophotography. The Photron 6\" RC's primary advantage is its native optical correction.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComa-Free Field:\u003c\/strong\u003e The RC design corrects for coma inherently, providing sharp stars to the edge of the field without extra lenses in the light path. An SCT will show significant coma without a dedicated corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Mirrors:\u003c\/strong\u003e Unlike the moving primary mirror of an SCT, the RC's fixed mirrors eliminate the potential for image shift during focusing, a critical feature for long-exposure imaging and autofocus routines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Ratio:\u003c\/strong\u003e At f\/9, the Photron provides more magnification than an SCT with an f\/6.3 reducer, making it better suited for smaller targets right out of the box.\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 iOptron Photron 6\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a tube weight of only \u003cstrong\u003e12 lbs\u003c\/strong\u003e, the Photron 6\" RC is well-supported by many entry-level to mid-range German Equatorial Mounts. A mount with a payload capacity of 20-25 lbs or more would be ideal to handle the OTA plus cameras and accessories. The scope comes with a \u003cstrong\u003eVixen-style dovetail bar\u003c\/strong\u003e for broad compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Photron 6\" RC good for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile optimized for astrophotography, the Photron 6\" RC can be used for visual astronomy. However, Ritchey-Chretien telescopes have a larger secondary mirror (\u003cstrong\u003e67mm\u003c\/strong\u003e in this case) compared to other designs, which reduces contrast slightly. This makes them better for high-power views of the Moon, planets, and bright deep-sky objects rather than wide-field, low-power sweeping.\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 extension tubes with the Photron 6\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included extension tubes (two \u003cstrong\u003e1\"\u003c\/strong\u003e and one \u003cstrong\u003e2\"\u003c\/strong\u003e) are used to adjust the distance between the focuser and your camera to achieve focus. The exact combination you need depends on your specific camera's sensor depth and any accessories like filter wheels or off-axis guiders. Start with the 2\" extender for a DSLR, or a 1\" extender for many dedicated astronomy cameras, and adjust as needed.\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 Photron 6\" RC over a Newtonian for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the Ritchey-Chretien design is the absence of coma, an optical aberration that makes stars at the edge of the field appear comet-shaped. While a fast Newtonian requires a separate coma corrector lens, the Photron 6\" RC is inherently corrected. Additionally, its \u003cstrong\u003e1370mm focal length\u003c\/strong\u003e provides more magnification in a shorter \u003cstrong\u003e19.1\" tube\u003c\/strong\u003e than a Newtonian of similar focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I image small galaxies like the Whirlpool Galaxy (M51) with the Photron 6\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The \u003cstrong\u003e1370mm focal length\u003c\/strong\u003e and \u003cstrong\u003e150mm aperture\u003c\/strong\u003e are an excellent combination for framing and resolving details in moderately sized galaxies like M51 or the Sombrero Galaxy (M104). The f\/9 focal ratio provides enough image scale to capture the spiral arms and dust lanes when paired with a camera with small pixels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat results can I expect on the Orion Nebula (M42) with this 150mm f\/9 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Orion Nebula (M42) is a very large and bright target. With the Photron 6\" RC's 1370mm focal length, you will be able to tightly frame the core region, including the Trapezium cluster. The scope's \u003cstrong\u003e0.76 arc second resolving power\u003c\/strong\u003e will allow you to capture intricate details and structure within the nebula's gas clouds, especially with short, stacked 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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\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\u003e1370mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e13.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e180X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Size\u003c\/td\u003e\n\u003ctd\u003e67mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2” 10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Bar\u003c\/td\u003e\n\u003ctd\u003eVixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e19.1”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e12 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003eOptional (base included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003e2” to 1.25” adapter, 2x 1\" extension tubes, 1x 2\" extension tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e18 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e24 x 13 x 12 in\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\"\u003ePhotron 6\" Ritchey-Chretien 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\" Compression 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\" Extension Tube\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\"\u003e2\" 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968081359133,"sku":"IOP-6111","price":781.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ioptron-photron-6__35063.1681926345.1280.1280.jpg?v=1684348859"},{"product_id":"ioptron-photron-14-ritchey-chretien","title":"iOptron Photron 14\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e14\" (355mm) Ritchey-Chretien Optical Design\u003c\/li\u003e\n\u003cli\u003e2848mm Focal Length at f\/8\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Truss Tube for Thermal Stability\u003c\/li\u003e\n\u003cli\u003eHeavy-duty 3\" Dual-Speed 10:1 Focuser\u003c\/li\u003e\n\u003cli\u003eThree Integrated Primary Mirror Cooling Fans\u003c\/li\u003e\n\u003cli\u003eWeighs 66 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\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\u003eiOptron Photron 14\" Ritchey-Chretien Telescope\u003c\/h2\u003e\n      \u003cp\u003eThe iOptron Photron 14\" Ritchey-Chretien delivers professional-grade imaging with its 355mm (14\") hyperbolic primary mirror and 2848mm focal length. This f\/8 optical system provides a naturally coma-free field ideal for modern sensors, all housed within a thermally stable carbon truss tube assembly weighing 66 lbs.\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\u003e14\" f\/8 Ritchey-Chrétien Optics: Coma-Free Imaging at 2848mm\u003c\/h3\u003e\n      \u003cp\u003eThe Ritchey-Chrétien is the design of choice for professional observatories, and for good reason. By using hyperbolic primary and secondary mirrors, the Photron 14\" eliminates off-axis coma, producing sharp stars across a wide, flat field without the need for additional corrector lenses. At a focal length of 2848mm, you have the image scale needed to resolve fine details in distant galaxies and planetary nebulae.\u003c\/p\u003e\n      \u003cp\u003eUnlike designs that use refractive elements, this pure two-mirror system has zero chromatic aberration. This ensures that all wavelengths of light come to the same focal point, resulting in higher contrast and tighter stars without color fringing, which is critical for both scientific measurement and aesthetic imaging.\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 Truss and 3 Fans for Thermal Stability\u003c\/h3\u003e\n      \u003cp\u003eA large mirror is susceptible to focus shift as ambient temperature changes. The Photron 14\" addresses this with a carbon truss tube, which has a near-zero coefficient of thermal expansion. This structure maintains the critical 2848mm focal length throughout the night, minimizing the need for constant refocusing during long imaging sessions.\u003c\/p\u003e\n      \u003cp\u003eTo reach thermal equilibrium quickly, the OTA is equipped with three built-in cooling fans behind the primary mirror. These fans accelerate the cooling of the 14\" mirror, reducing tube currents and ensuring the sharpest possible views much faster than a passively cooled system.\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\u003e3\" Dual-Speed Focuser for Heavy Imaging Loads\u003c\/h3\u003e\n      \u003cp\u003eTo support modern imaging trains, the Photron 14\" features a robust 3” dual-speed focuser. The large diameter prevents vignetting on full-frame and larger sensors, while the 10:1 fine focus knob allows for the precise adjustments required at an f\/8 focal ratio. This heavy-duty focuser is designed to carry a full payload of a camera, filter wheel, and off-axis guider without flexure.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDual Losmandy-Style Dovetails:\u003c\/strong\u003e A mounting bar on the bottom provides a secure connection to your mount, while a second bar on top serves as a rigid platform for guide scopes, power distribution boxes, or other accessories.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExtension Tubes:\u003c\/strong\u003e Two 1\" extension tubes and one 2\" extension tube are included to help you achieve the correct back-focus distance for your specific camera and accessory combination.\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\u003ePhotron 14\" RC vs. a 14\" SCT: A 66 lb Imaging Specialist\u003c\/h3\u003e\n      \u003cp\u003eWhile a 14\" Schmidt-Cassegrain (SCT) with a corrector is a versatile instrument, the Photron 14\" RC is a specialist built for one purpose: uncompromising imaging. The RC's open-truss design and active cooling allow it to reach ambient temperature faster than a sealed SCT, and its lack of a corrector plate means one less surface to collect dew.\u003c\/p\u003e\n      \u003cp\u003eAn SCT may offer more flexibility with options like HyperStar for f\/2 wide-field imaging. However, for deep-sky imaging at native focal length, the RC's inherent coma correction and absence of chromatic aberration provide a distinct advantage for capturing the highest resolution data possible with a 14\" aperture.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the iOptron Photron 14\" RC?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith a tube weight of \u003cstrong\u003e66 lbs\u003c\/strong\u003e before adding any camera gear, the Photron 14\" requires a high-capacity equatorial mount. For reliable imaging, you should choose a mount with a rated payload capacity of at least 90-100 lbs, such as an iOptron CEM120, a Losmandy Titan, or a similar class of observatory-grade mount.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a Ritchey-Chretien design better for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Ritchey-Chretien (RC) design uses two hyperbolic mirrors to correct for \u003cstrong\u003ecoma\u003c\/strong\u003e, an optical aberration that makes stars at the edge of the field of view look like comets. This correction is inherent to the design and works across the visual spectrum. It also has no refractive lenses, meaning it is completely free of \u003cstrong\u003echromatic aberration\u003c\/strong\u003e (color fringing).\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Photron 14\" RC perform on small galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Photron 14\" RC is ideal for targets like M51. Its long \u003cstrong\u003e2848mm focal length\u003c\/strong\u003e provides the perfect image scale to frame the galaxy and its companion, while the 14\" aperture resolves fine details like dust lanes and spiral arms, especially with good seeing conditions.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the iOptron Photron 14\" suitable for imaging the entire North American Nebula (NGC 7000)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this telescope is not designed for extremely wide-field targets like NGC 7000. Its 2848mm focal length creates a very narrow field of view, making it a \"galaxy hunter\" and planetary nebula instrument. To image the entire North American Nebula, you would need a short focal length refractor or a faster system like a Rowe-Ackermann Schmidt Astrograph (RASA).\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the included 1\" and 2\" extension tubes for?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe extension tubes are used to set the correct back-focus distance between the focuser and your camera sensor. Different cameras, filter wheels, and off-axis guiders have different thicknesses. The included \u003cstrong\u003etwo 1\" extensions and one 2\" extension\u003c\/strong\u003e allow you to configure your imaging train to reach focus properly.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Photron 14\" RC require collimation?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, like all reflector telescopes, the Photron 14\" RC will require periodic collimation. Aligning the hyperbolic primary and secondary mirrors is more sensitive than on a standard Newtonian but is essential for achieving sharp, uniform stars across the field. It is recommended to use a laser collimator or Cheshire eyepiece for this process.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e14\" (355mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2848mm\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\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3” 10:1 dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon truss tube\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e960mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e66 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Cooling\u003c\/td\u003e\n\u003ctd\u003eYes (three built-in fans)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDovetail (Bottom)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMounting Bar (Top)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003e2x 1\" extension tubes, 1x 2\" extension tube\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e55 x 27 x 26 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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\"\u003ePhotron 14\" RC 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\"\u003e1\" Focuser Extension Tube\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\"\u003e2\" Focuser 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  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Telescope Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968081457437,"sku":"IOP-6116","price":9379.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/iOptron-RC-Photron-14__83140.1682950317.1280.1280.jpg?v=1684348861"},{"product_id":"ioptron-photron-10-ritchey-chretien","title":"iOptron Photron 10\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10\" (254mm) Ritchey-Chretien Optical Design\u003c\/li\u003e\n\u003cli\u003e2032mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Truss Tube for Thermal Stability\u003c\/li\u003e\n\u003cli\u003e3-inch, 10:1 Dual-Speed Crayford Focuser\u003c\/li\u003e\n\u003cli\u003e3 Integrated Primary Mirror Cooling Fans\u003c\/li\u003e\n\u003cli\u003eWeighs 34 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\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\u003eiOptron Photron 10\" Ritchey-Chretien\u003c\/h2\u003e\n\u003cp\u003eThe iOptron Photron 10\" Ritchey-Chretien combines a 254mm aperture with a 2032mm focal length in a coma-free optical design built specifically for astrophotography. Its f\/8 focal ratio provides high-resolution sampling for galaxies and planetary nebulae, while the carbon truss tube holds the 34 lb optical assembly at a stable 650mm length regardless of temperature swings. A heavy-duty 3-inch, 10:1 dual-speed Crayford focuser manages heavy camera payloads, and three integrated cooling fans ensure rapid thermal stabilization for sharp, steady images.\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\u003e10\" f\/8 Ritchey-Chretien Optics: Coma-Free Imaging at 2032mm\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chretien (RC) optical design uses hyperbolic primary and secondary mirrors to eliminate off-axis coma, an aberration that distorts stars into comet-like shapes at the edge of the field in other reflector designs. This means you get pinpoint stars across a large, flat field without needing a separate coma corrector lens. With a 2032mm focal length and 10\" of aperture, the Photron RC delivers the image scale required to resolve fine details in distant galaxies and small planetary 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\u003eCarbon Truss Tube and 3-Fan Cooling System\u003c\/h3\u003e\n\u003cp\u003eFocus stability is critical for long-exposure imaging, especially at a 2032mm focal length. The Photron 10\" RC uses a carbon fiber truss tube, which has a near-zero coefficient of thermal expansion. This prevents the focal point from shifting as ambient temperature drops throughout the night, keeping your images sharp without constant refocusing. To achieve thermal equilibrium quickly, three built-in cooling fans actively circulate air behind the primary mirror, reducing tube currents and ensuring your imaging session starts with the sharpest possible views.\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\" Dual-Speed Focuser and Dual Losmandy Bars\u003c\/h3\u003e\n\u003cp\u003eThis telescope is built to support a serious imaging train. The massive 3-inch Crayford focuser prevents vignetting with large-format camera sensors and can handle the weight of a filter wheel, off-axis guider, and camera without flexure. The 10:1 dual-speed mechanism allows for precise, critical focusing adjustments. For mounting, the Photron 10\" RC includes two Losmandy-style dovetail bars; one for attaching to your mount and a second on top for mounting guide scopes, power distribution boxes, 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\u003ePhotron 10\" RC vs. a 10\" SCT: The Astrophotographer's Choice\u003c\/h3\u003e\n\u003cp\u003eFor imagers choosing a 10-inch instrument, the primary alternative is a Schmidt-Cassegrain Telescope (SCT). While an SCT is often more compact and versatile for visual use, the Photron RC presents key advantages for dedicated astrophotography.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComa Correction:\u003c\/strong\u003e The RC design is natively coma-free. An SCT exhibits significant coma and requires an additional corrector lens to produce sharp stars edge-to-edge, adding cost and complexity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser Design:\u003c\/strong\u003e The Photron's external Crayford focuser eliminates the \"image shift\" common to SCTs, which move the primary mirror to focus. This provides a more stable and repeatable focusing platform for imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Mirrors:\u003c\/strong\u003e The mirrors in the RC are fixed in place, leading to better collimation stability compared to the moving-mirror design of an SCT.\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 iOptron Photron 10\" RC's optical design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003eRitchey-Chretien\u003c\/strong\u003e design is its intrinsic correction for coma. This means stars remain sharp, pinpoint objects across the entire photographic field without the need for an extra coma corrector lens, making it a superior choice for imaging with large camera sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Photron 10\" RC's carbon truss tube important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ecarbon fiber truss tube\u003c\/strong\u003e has a very low coefficient of thermal expansion. This prevents the telescope's 2032mm focal length from changing as temperatures drop overnight, which keeps the focus stable during long imaging sessions. An aluminum or steel tube would shrink in the cold, causing focus shift.\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 34 lb iOptron Photron 10\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor an optical tube weighing \u003cstrong\u003e34 lbs\u003c\/strong\u003e with a long focal length of \u003cstrong\u003e2032mm\u003c\/strong\u003e, you need a very stable equatorial mount. We recommend a mount with a payload capacity of at least 50-60 lbs to ensure steady tracking and guiding. Mounts in the iOptron CEM60\/CEM70, Sky-Watcher EQ6-R Pro, or Celestron CGX\/CGX-L class are appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the included extension tubes for the Photron 10\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, most likely. Ritchey-Chretien telescopes have a long back focus distance to accommodate various imaging accessories like off-axis guiders and filter wheels. The included \u003cstrong\u003e1\" and 2\" extension tubes\u003c\/strong\u003e are used to place your camera or eyepiece at the correct focal plane. The exact combination you need will depend on your specific imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Photron 10\" RC perform on small galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2032mm focal length\u003c\/strong\u003e at f\/8 is ideal for targets like the Whirlpool Galaxy (M51). The 10\" aperture gathers enough light to capture faint details, while the long focal length provides the necessary image scale to clearly resolve the spiral arms and the connecting bridge to its companion galaxy, NGC 5195.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Photron 10\" RC's f\/8 focal ratio suitable for imaging the Ring Nebula (M57)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The f\/8 focal ratio is a great match for small, bright planetary nebulae like the Ring Nebula (M57). It provides high magnification to make the nebula's structure apparent, and with modern CMOS cameras, exposure times are very manageable. This setup will easily resolve the central star within M57 from a dark site with good seeing.\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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e10\" (254mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2032mm\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\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3” 10:1 Crayford dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon truss tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Cooling\u003c\/td\u003e\n\u003ctd\u003eYes (three built-in fans)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail (Bottom)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Bar (Top)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e650mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e34 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e50 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e33 x 21 x 20 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003e2x 1\" Extension Tubes, 1x 2\" Extension Tube\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\"\u003ePhotron 10\" Ritchey-Chretien 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\"\u003e1\" Extension Tube\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\"\u003e2\" 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968091549981,"sku":"IOP-6114","price":4477.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/6114-4__81737.1683224337.1280.1280.jpg?v=1684348984"},{"product_id":"ioptron-photron-12-ritchey-chretien","title":"iOptron Photron 12\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e12\" (304mm) Ritchey-Chretien Optics\u003c\/li\u003e\n\u003cli\u003e2432mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Truss Tube Design\u003c\/li\u003e\n\u003cli\u003e3\" Dual-Speed 10:1 Crayford Focuser\u003c\/li\u003e\n\u003cli\u003e53 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\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\u003eiOptron Photron 12\" Ritchey-Chretien Telescope\u003c\/h2\u003e\n\u003cp\u003eThe iOptron Photron 12\" Ritchey-Chretien delivers professional-grade imaging capabilities through its pure two-mirror optical design. Its 12\" (304mm) aperture and 2432mm focal length provide the image scale needed for high-resolution views of distant galaxies and nebulae at a native f\/8 focal ratio. The entire 53 lb optical assembly is supported by a rigid carbon truss tube and features a robust 3\" dual-speed focuser, ensuring a stable platform for demanding 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\u003eRitchey-Chretien Optics: The 12\" Coma-Free Astrograph\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chretien (RC) design uses hyperbolic primary and secondary mirrors to eliminate off-axis coma, a critical aberration that distorts stars at the edge of the field in other reflector designs. This makes the Photron 12\" a true astrograph, producing pinpoint stars across a wide, flat field without the need for a separate coma corrector. It's the same optical system trusted by professional observatories, scaled for the advanced amateur imager.\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 Truss Tube: 53 lbs of Thermally Stable Structure\u003c\/h3\u003e\n\u003cp\u003eWeighing in at 53 lbs, the Photron 12\" is built around a carbon fiber truss tube. This material choice is critical for long-exposure imaging, as carbon fiber has a near-zero coefficient of thermal expansion. As temperatures drop during the night, the 2432mm focal length remains constant, preventing focus shift that can ruin an image. The open truss design also allows the optics to cool to ambient temperature more quickly than a closed-tube 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\u003eImaging-Ready Mechanics: A 3\" Focuser and Dual Losmandy Bars\u003c\/h3\u003e\n\u003cp\u003eThis telescope is engineered to support a complete imaging payload. The massive 3\" Crayford focuser features a 10:1 dual-speed mechanism for precise adjustments and can handle heavy cameras, filter wheels, and off-axis guiders without flexure. To accommodate various back-focus requirements, the OTA includes two 1\" and one 2\" extension tubes. Dual Losmandy-style dovetail bars provide a secure connection to the mount and offer ample space on top for mounting guide scopes and 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\u003eActive Thermal Control: Triple Fans for a 304mm Primary\u003c\/h3\u003e\n\u003cp\u003eA large 304mm primary mirror can hold significant heat, which creates tube currents that degrade image sharpness. To combat this, the Photron 12\" incorporates three built-in cooling fans behind the primary mirror. These fans accelerate the cooling process, allowing the mirror to reach thermal equilibrium quickly so you can start capturing stable, high-resolution data sooner.\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\u003ePhotron 12\" RC vs. 11\" SCT: Optical Design and Field Purity\u003c\/h3\u003e\n\u003cp\u003eAn imager considering the Photron 12\" RC might also look at a popular 11\" Schmidt-Cassegrain Telescope (SCT). While similar in aperture, their designs serve different priorities.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSCT Advantage:\u003c\/strong\u003e SCTs are typically more compact and lighter for their aperture. Their closed-tube design protects the optics from dust and dew, and they are often excellent visual instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRC Advantage:\u003c\/strong\u003e The Photron RC provides a coma-free field by design, without any corrector lenses in the light path. This optical purity is a major advantage for imaging. The open truss tube provides superior thermal management, a critical factor for maintaining focus and image stability over long sessions. The primary trade-off for the RC's optical purity is that it requires more precise collimation than an SCT.\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\"\u003eWhy choose a Ritchey-Chretien like the Photron 12\" for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Ritchey-Chretien design is a dedicated astrograph, meaning it's optimized for photography. It uses two hyperbolic mirrors to eliminate an optical aberration called coma, resulting in sharp, pinpoint stars across the entire imaging field without needing an extra corrector lens. This makes the \u003cstrong\u003eiOptron Photron 12\" RC\u003c\/strong\u003e ideal for capturing wide, clean fields 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 needed for the 53 lb iOptron Photron 12\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an optical tube weight of \u003cstrong\u003e53 lbs\u003c\/strong\u003e, plus the weight of your camera and guide scope, you will need a heavy-duty equatorial mount with a payload capacity of at least 70-80 lbs for stable imaging. Mounts in the Losmandy G11, iOptron CEM70\/CEM120, or Celestron CGX-L class are appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the carbon truss tube on the Photron 12\" help with imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCarbon fiber has a very low thermal expansion rate. This means that as the temperature changes overnight, the \u003cstrong\u003e2432mm focal length\u003c\/strong\u003e of the telescope remains stable. This prevents your focus from shifting, which is a common problem with metal-tube telescopes and can ruin long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the included extension tubes with the Photron 12\" RC for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Photron 12\" comes with two 1\" and one 2\" extension tubes for the focuser. These are used to adjust the spacing between the focuser and your camera to achieve proper focus. Different cameras, filter wheels, and other accessories require different amounts of back focus, and these rings provide the flexibility to accommodate most imaging setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Photron 12\" RC perform on a small galaxy like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2432mm focal length\u003c\/strong\u003e of the Photron 12\" is ideal for targets like the Whirlpool Galaxy (M51). This long focal length provides high magnification, allowing you to frame the galaxy and its companion, NGC 5195, perfectly while resolving fine detail like spiral arms and dust lanes. The \u003cstrong\u003e12\" aperture\u003c\/strong\u003e gathers enough light to capture faint structures in a reasonable amount of exposure time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a field flattener with the iOptron Photron 12\" RC on a large sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Ritchey-Chretien design is inherently free from coma, it does have some natural field curvature, especially noticeable on full-frame or larger sensors. For the most demanding applications and perfectly flat fields edge-to-edge, a dedicated field flattener or reducer\/flattener is recommended. For sensors of APS-C size or smaller, the native field is often flat enough not to require one.\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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e12\" (304mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2432mm\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\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3\" 10:1 Dual-Speed Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon truss tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Dovetail (Bottom)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Rail (Top)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Cooling\u003c\/td\u003e\n\u003ctd\u003eYes (Three built-in fans)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Extension Tubes\u003c\/td\u003e\n\u003ctd\u003e2x 1\" and 1x 2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e850mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e53 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e78 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e43 x 25 x 23 in\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968091582749,"sku":"IOP-6115","price":5821.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/6115-2__65464.1683224704.1280.1280.jpg?v=1684348985"},{"product_id":"ioptron-photron-16-ritchey-chretien","title":"iOptron Photron 16\" Ritchey-Chretien","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e16\" (406mm) Aperture\u003c\/li\u003e\n\u003cli\u003e3248mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eRitchey-Chretien Optical Design\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Truss Tube\u003c\/li\u003e\n\u003cli\u003e3\" 10:1 Dual-Speed 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\u003eiOptron Photron 16\" f\/8 Ritchey-Chretien Truss Tube OTA\u003c\/h2\u003e\n\u003cp\u003eThe iOptron Photron 16\" Ritchey-Chretien delivers the optical purity required for serious deep-sky imaging, combining a massive 16\" (406mm) aperture with a 3248mm focal length for high-resolution views of distant galaxies and nebulae. Its carbon truss tube construction maintains thermal stability while keeping the total OTA weight to 93 lbs for an instrument of this scale. The system is anchored by a robust 3\" 10:1 dual-speed focuser and includes three primary mirror cooling fans to ensure your optics reach equilibrium quickly for sharp, stable images.\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\u003e16\" f\/8 Ritchey-Chrétien Optics for Coma-Free Imaging\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chretien (RC) design utilizes hyperbolic primary and secondary mirrors to eliminate off-axis coma, a critical aberration that distorts stars at the edge of the field in other reflector designs. This creates a wide, flat, and corrected field of view, making the Photron 16\" an ideal platform for cameras with large sensors. The 406mm aperture gathers immense amounts of light, while the 3248mm focal length provides the image scale needed to resolve fine details in targets like the spiral arms of M51 or the jets in M87.\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 Truss Tube and 3 Fans for Thermal Stability\u003c\/h3\u003e\n\u003cp\u003eAt a focal length of 3248mm, even minute changes from thermal expansion can cause significant focus shift during an imaging session. The Photron 16\" RC uses a carbon fiber truss tube, which has a near-zero coefficient of thermal expansion, ensuring the distance between the primary and secondary mirrors remains constant as temperatures drop. The open truss design also promotes airflow, and three integrated cooling fans on the primary mirror accelerate thermal equalization, minimizing tube currents and delivering sharp images faster.\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\" Dual-Speed Focuser and Dual Losmandy Bars\u003c\/h3\u003e\n\u003cp\u003eAn instrument of this caliber requires a focuser that can support a heavy imaging train without flexure. The 3\" dual-speed Crayford focuser provides a rigid connection point for large cameras, filter wheels, and off-axis guiders, while its 10:1 fine focus knob allows for the precise adjustments essential at an f\/8 focal ratio. The scope includes two 1\" and one 2\" extension tubes to help you achieve the correct back focus for your specific camera setup. Dual Losmandy-style dovetail bars—one for mounting and one on top for accessories—provide a secure and versatile platform for your entire rig.\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\u003ePhotron 16\" RC vs. 14\" SCT: An Imager's Choice\u003c\/h3\u003e\n\u003cp\u003eWhen considering a large-aperture imaging scope, many compare an RC like the Photron 16\" to a high-end Schmidt-Cassegrain (SCT). While a 14\" SCT is often more compact and its sealed tube offers protection from dust, the Photron 16\" RC presents distinct advantages for the dedicated astrophotographer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture:\u003c\/strong\u003e The Photron's 16\" mirror provides roughly 30% more light-gathering area than a 14\" optic, allowing you to capture fainter details in less time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Purity:\u003c\/strong\u003e As a pure two-mirror system, the RC has no corrector plate, eliminating potential chromatic aberration and providing maximum light transmission without extra glass surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e The open truss design and active cooling fans allow the Photron 16\" to acclimate to ambient temperatures much faster than a sealed SCT, which can suffer from heat trapped inside the tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Mirrors:\u003c\/strong\u003e The RC's primary mirror is fixed in place, preventing the \"mirror flop\" that can occur in some SCTs during focusing, which is a critical benefit for long-exposure imaging.\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 iOptron Photron 16\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an OTA weight of \u003cstrong\u003e93 lbs\u003c\/strong\u003e, the Photron 16\" RC requires a very substantial equatorial mount. You should look for a mount with a minimum instrument capacity of 100-120 lbs to ensure stability for imaging. Mounts in the class of the iOptron CEM120, Losmandy Titan, or Software Bisque Paramount are appropriate choices.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Photron 16\" RC a good telescope for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can certainly use the Photron 16\" for visual astronomy, it is specifically designed for astrophotography. Ritchey-Chretien telescopes have a large secondary mirror, which increases the central obstruction. This reduces contrast slightly compared to a Newtonian or Dobsonian of the same aperture, which are typically preferred for visual work. However, on planets and bright deep-sky objects, the views will still be impressive due to its large 16\" aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I collimate the iOptron Photron 16\" RC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCollimating an RC involves adjusting both the secondary and primary mirrors, which is more complex than collimating a simple Newtonian. It typically requires a high-quality laser collimator and often a Cheshire or a specialized tool like a Takahashi collimating scope. Precise collimation is absolutely essential to take advantage of the coma-free optics, especially at its long \u003cstrong\u003e3248mm focal length\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of image scale will the Photron 16\" RC provide for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Photron 16\" RC's \u003cstrong\u003e3248mm focal length\u003c\/strong\u003e is designed for high-magnification imaging of smaller deep-sky objects like galaxies and planetary nebulae. When aimed at a vast target like the Andromeda Galaxy (M31), it will produce a very detailed, high-resolution view of the galaxy's core. However, you would need to create a large mosaic to capture the entire galaxy, as it will not fit in the field of view of most common astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 3\" focuser on the Photron 16\" RC illuminate a full-frame sensor without vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e3\" focuser\u003c\/strong\u003e is specifically chosen to provide a large, unvignetted field of view suitable for full-frame (35mm format) sensors and even larger sensors with the appropriate field flattener or reducer. This ensures that the corners of your images are fully illuminated, which is a key requirement for serious astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Photron 16\" RC use a carbon truss tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fiber truss tube provides two key advantages for a long focal length imaging telescope. First, its low weight-to-stiffness ratio helps manage the OTA's total weight (\u003cstrong\u003e93 lbs\u003c\/strong\u003e). Second, and more importantly, carbon fiber has a very low coefficient of thermal expansion, which prevents the telescope's focus from shifting as the temperature changes throughout the night.\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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e16\" (406mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3248mm\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\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3\" Crayford, 10:1 dual-speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon truss tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e1114mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e93 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Mirror Cooling\u003c\/td\u003e\n\u003ctd\u003eThree built-in fans with battery holder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Dovetails\u003c\/td\u003e\n\u003ctd\u003eDual Losmandy-style bars (top and bottom)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003e2x 1\" Extension Tubes, 1x 2\" Extension Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e99 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e55.5 x 29.5 x 27.5 in\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\"\u003ePhotron 16\" Ritchey-Chretien 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\"\u003e1\" Focuser Extension Tube\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\"\u003e2\" Focuser 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/ioptron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eiOptron 2-Year Telescope Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":44968091615517,"sku":"IOP-6117","price":12319.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/6117-2__46241.1683224893.1280.1280.jpg?v=1684348987"},{"product_id":"ioptron-6113","title":"iOptron Photron™ 10-inch Ritchey-Chrétien Telescope (RC10) 3'' Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e250mm (10-inch) Ritchey-Chrétien Optical Design\u003c\/li\u003e\n\u003cli\u003e2000mm Focal Length at f\/8\u003c\/li\u003e\n\u003cli\u003e0.46 arc second Resolving Power\u003c\/li\u003e\n\u003cli\u003e3-inch Dual Speed Focuser\u003c\/li\u003e\n\u003cli\u003e35 lb Steel Tube with Three Cooling Fans\u003c\/li\u003e\n\u003cli\u003eDual Losmandy-style Dovetail Bars\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\u003ePhotron™ 10-inch Ritchey-Chrétien Telescope (RC10) 3'' Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Photron™ RC10 combines a large 250mm aperture with a 2000mm focal length in a native f\/8 Ritchey-Chrétien optical design, delivering a coma-free imaging field ideal for modern sensors. This astrograph achieves a theoretical resolving power of 0.46 arc seconds, enabling you to capture fine details in distant galaxies and planetary nebulae. The robust imaging platform is built around a heavy-duty 3-inch dual-speed focuser and a 35 lb steel optical tube equipped with three primary mirror cooling fans for rapid thermal stabilization.\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\u003e10-inch f\/8 Ritchey-Chrétien Optics: 0.46 Arc Second Resolution\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey-Chrétien configuration uses hyperbolic primary and secondary mirrors to eliminate coma, an optical aberration that distorts stars at the edge of the field in other reflector designs. With a 250mm clear aperture and 2000mm focal length, the Photron RC10 provides the image scale necessary for resolving small targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57). The system's 0.46 arc second resolution and 14.7 limiting magnitude give you the power to pull in faint details from your backyard observatory.\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-inch Dual-Speed Focuser: Support for Heavy Imaging Payloads\u003c\/h3\u003e\n\u003cp\u003eA key feature of the RC10 is its massive 3-inch dual-speed focuser, a significant upgrade for serious imagers. This large-format focuser minimizes vignetting on full-frame and larger sensors and provides the rigidity to carry heavy camera packages, filter wheels, and off-axis guiders without flexure. The fine-focus knob is critical for achieving sharp stars at the 2000mm focal length. To accommodate a wide range of cameras and accessories, the telescope includes two 1-inch and one 2-inch extension tubes to correctly set the 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\u003e35 lb Steel Tube Construction with Active Cooling\u003c\/h3\u003e\n\u003cp\u003eThe Photron RC10 is built with a steel tube, which provides excellent rigidity and thermal stability, though it contributes to a total OTA weight of 35 lbs. To combat thermal currents inside the closed tube, three built-in fans are mounted behind the primary mirror to accelerate cooling to ambient temperature, reducing tube seeing and ensuring the sharpest possible images. The OTA is equipped with two Losmandy-style dovetail bars—one for mounting to your equatorial mount and a second on top for attaching guide scopes, computers, 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\u003ePhotron RC10 vs. Other 10\" RCs: Focuser and Tube Material\u003c\/h3\u003e\n\u003cp\u003eWhen comparing the Photron RC10 to other 10-inch Ritchey-Chrétien telescopes, such as those from GSO or Astro-Tech, the primary differences lie in the focuser and tube material.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompetitor Advantage:\u003c\/strong\u003e Many competing 10\" RCs are available with carbon fiber tubes. Carbon fiber is lighter than steel and has a lower coefficient of thermal expansion, which can reduce the need for focus adjustments during temperature drops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhotron RC10 Advantage:\u003c\/strong\u003e The included 3-inch focuser on the Photron is a significant upgrade over the 2-inch focusers commonly found on standard models. For imagers using large sensors or heavy equipment, the larger, more robust focuser of the RC10 is a decisive benefit that prevents both vignetting and mechanical flex.\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 does the Photron RC10 require?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Photron RC10 has an optical tube weight of \u003cstrong\u003e35 lbs\u003c\/strong\u003e. For astrophotography, you should add the weight of your camera, guide scope, and all accessories, which can easily bring the total payload to 40-45 lbs. A mount with a payload capacity of at least 50-60 lbs, such as an iOptron CEM60\/70 or Celestron CGX, is recommended for stable, long-exposure imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Photron RC10 good for imaging small galaxies like the Sombrero Galaxy (M104)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The \u003cstrong\u003e2000mm focal length\u003c\/strong\u003e provides the ideal image scale for capturing details in smaller deep-sky objects like M104 or planetary nebulae like the Dumbbell Nebula (M27). The coma-free field ensures that stars across the frame remain sharp, highlighting the structure of your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Photron RC10 need a field flattener or reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Ritchey-Chrétien design is inherently free of coma, it does have natural field curvature. For cameras with smaller sensors (APS-C or smaller), this may not be noticeable. However, for full-frame or larger sensors, a dedicated field flattener is recommended to achieve perfectly sharp stars across the entire image. Reducers are also available to shorten the focal ratio for wider-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Photron RC10 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can, but it is not its primary design purpose. RCs are optimized for photographic use. The large \u003cstrong\u003e110mm secondary mirror\u003c\/strong\u003e creates a significant central obstruction, which reduces image contrast compared to a Newtonian or refractor of similar aperture. While planets and bright objects will be sharp, it will not deliver the same high-contrast views as a dedicated visual telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there three extension tubes included with the Photron RC10?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eRitchey-Chrétien telescopes have a long back focus distance to accommodate various imaging accessories. The included \u003cstrong\u003e1-inch (x2) and 2-inch (x1) extension tubes\u003c\/strong\u003e are used to bridge the gap between the focuser and your camera's sensor. The combination you use will depend on your specific imaging train, whether you're using a DSLR, a cooled CMOS camera, an off-axis guider, or a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow difficult is it to collimate the Photron RC10?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCollmating an RC is more involved than a Newtonian or SCT because both the primary and secondary mirrors are adjustable and hyperbolic. It requires patience and precision, and typically involves using a Cheshire eyepiece and a high-quality laser collimator. However, once collimated, a well-built RC like the Photron RC10 tends to hold its alignment very well.\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\u003eRitchey-Chretien\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e250mm (10\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e2000mm\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\u003eResolving Power\u003c\/td\u003e\n\u003ctd\u003e0.46 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e14.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Useful Magnification\u003c\/td\u003e\n\u003ctd\u003e295X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecondary Mirror Diameter\u003c\/td\u003e\n\u003ctd\u003e110mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3\" dual speed focuser\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\u003ePrimary Mirror Cooling\u003c\/td\u003e\n\u003ctd\u003eThree built-in fans (battery holder included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e28.4”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Weight\u003c\/td\u003e\n\u003ctd\u003e35 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Dovetail (Bottom)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Dovetail (Top)\u003c\/td\u003e\n\u003ctd\u003eLosmandy-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope Base\u003c\/td\u003e\n\u003ctd\u003eInstalled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e48 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e34.5\" x 17\" x 16.75\"\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\"\u003ePhotron 10\" f\/8 Ritchey-Chrétien 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\" 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\"\u003e1\" Extension Tube\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\"\u003e2\" to 1.25\" Compression 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"#\" rel=\"noopener\" target=\"_blank\"\u003ePhotron Manufacturer's Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"iOptron","offers":[{"title":"Default Title","offer_id":52917293351197,"sku":"IOP-6113","price":4043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/iOptron-Photron-10-inch-Ritchey-Chr-tien-Telescope-RC10-3-Focuser-1_a6043c6d-be43-498f-baa2-bcaa743362b9.jpg?v=1789142084"}],"url":"https:\/\/davidastro.com\/collections\/ioptron-photron-ritchey-chretien-telescopes.oembed","provider":"David Astro","version":"1.0","type":"link"}