{"product_id":"tele-vue-tv-np101is-ota-used","title":"Tele Vue TV-NP101is OTA - Used","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eUsed, with NPR-2073 Reducer, LCL-1069 Corrector, Focus Boss II and HSM Motor\u003c\/li\u003e\n\u003cli\u003e101mm Aperture\u003c\/li\u003e\n\u003cli\u003e540mm Focal Length, f\/5.4 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e4-Element Nagler-Petzval APO Optical Design\u003c\/li\u003e\n\u003cli\u003e2.4\" Dual-Speed (10:1) Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eCovers up to 52mm Diagonal Sensors\u003c\/li\u003e\n\u003cli\u003eWeighs 10.7 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\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\u003eTele Vue TV-NP101is OTA - Used\u003c\/h2\u003e\n\u003cp\u003eThis used Tele Vue TV-NP101is is a 101mm APO (Nagler-Petzval) \u003ca href=\"\/en-us\/collections\/refractors\"\u003erefractor\u003c\/a\u003e that delivers a fast f\/5.4 focal ratio and a 540mm focal length for a maximum visual field of 4.9°. Its 4-element design achieves a photographic resolution of 267 line pairs per mm across a flat field covering sensors up to a 52mm diagonal, all within a 25.5\" optical tube that weighs just 10.7 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\u003eA 101mm Legacy: The Nagler-Petzval Design Refined\u003c\/h3\u003e\n\u003cp\u003eThe NP101is represents the culmination of a design philosophy that Al Nagler began in 1980 with the 5\" f\/4 Multi-Purpose Telescope. Al took Petzval's portrait lens concept of widely spaced doublets and patented a fast telescope version to test \u003ca href=\"\/en-us\/collections\/eyepieces\"\u003eeyepieces\u003c\/a\u003e. Its fast, wide and flat field led through the 4\" f\/5.5 Renaissance, the fluorite-equipped 4\" f\/5 Genesis, the SDF and the Tele Vue-101 to the NP101, which reached virtually ideal color correction and improved field flatness. The \"is\" (Imaging System) version arrived in 2006 with larger rear elements and a larger focuser.\u003c\/p\u003e\n\u003cp\u003eTele Vue telescopes are built start to finish by a single technician in Chester, New York, with quality checks at several critical steps. Lens spacings are hand-tuned and each focuser is hand-fitted, which is how Tele Vue assures diffraction-limited performance, and every NP101is is tested there 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\u003e4-Element, f\/5.4 Optics: 1.1 Arc-Second Resolution\u003c\/h3\u003e\n\u003cp\u003eThe heart of the NP101is is its 4-element, two-group Nagler-Petzval objective. This design consists of an air-spaced doublet in the front cell and a larger-diameter doublet at the rear, and the larger rear doublet adds illumination at the edge of the field, which matters for large chips that are sensitive to light fall-off. The flat field is built into the objective, so no \u003ca href=\"\/en-us\/collections\/flatteners-and-reducers\"\u003efield flattener\u003c\/a\u003e is needed for most cameras. The fully multi-coated optics deliver a visual resolution of 1.1 arc-seconds, allowing you to resolve fine detail on planets and separate tight double stars.\u003c\/p\u003e\n\u003cp\u003eWith a clear aperture of 101.6mm (4 inches), its aperture gain is 211 compared to a 7mm exit pupil. Combined with f\/5.4, that light grasp brings out faint nebulosity and resolves the brighter globular and open clusters into stars. Tele Vue sums it up as an imaging and visual tour de force.\u003c\/p\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 2.4\" Imaging System Focuser: 10:1 Precision and 12 lb Payload\u003c\/h3\u003e\n\u003cp\u003eThe NP101is uses a 2.4\" rack-and-pinion focuser whose drawtube has a 3\" entrance, so its 2.4\" exit passes all the field rays leaving the rear elements; a larger focuser would add no illumination. The integrated Focusmate provides a 10:1 dual-speed reduction for critical focusing, while the drawtube is supported by a Teflon sleeve and secured by two adjustable tension screws and three lock screws. Each focuser is tested to hold 12 lb without flex; tighten the tension screws in unison to avoid focus shift.\u003c\/p\u003e\n\u003cp\u003eThe focuser's end-ring is designed for the Tele Vue Imaging System (\"is\"), allowing direct, threaded connections for cameras and accessories. The end ring is pre-set parallel to the focal plane, and if you see tilt in your images you can jack it with the supplied Allen keys and lock it with jam screws; a quarter turn of a jack screw moves 198 microns. For visual use, the indexed 2\" Accessory Adapter carries a brass clamp ring, and its three thumb screws give enough holding power for the heaviest visual 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\u003eA 25.5\" Powder-Coated Tube and Hard Case\u003c\/h3\u003e\n\u003cp\u003eThe NP101is optical tube measures 25.5\" and is powder-coated aluminum. A captive sliding metal dew shield shades the objective, and a screw-on metal lens cover protects it in storage.\u003c\/p\u003e\n\u003cp\u003eThe front doublet attaches to the tube with three alignment screws that you should never touch. The custom hard-shell case (19 lbs with the telescope inside) has a lid that opens 180° and two removable accessory bags that must stay in place when carrying, as they hold the telescope down; the case is cut out for an optional Starbeam and Everbrite \u003ca href=\"\/en-us\/collections\/diagonals\"\u003ediagonal\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\u003eSupporting the 10.7 lb OTA: Mounting and Balancing\u003c\/h3\u003e\n\u003cp\u003eThe tube is 4\" in diameter and Tele Vue offers two ring options. The single ring (RS4-8004) is fine for visual and photographic use and is recommended with all Tele Vue \u003ca href=\"\/en-us\/collections\/alt-azimuth-mounts\"\u003ealt-az mounts\u003c\/a\u003e because it allows more balancing range. The dual ring set (MRS-4011) is best suited for critical photography and CCD imaging, with a central bar that varies ring spacing to fit a variety of mount heads and the BPL-1098 plate underneath for Tele Vue alt-az mounts.\u003c\/p\u003e\n\u003cp\u003eOn both systems you balance the tube by unlocking the bat handle screws, sliding the tube fore or aft and retightening. The bottoms carry 1\/4-20 holes for mounting studs, and the accessory grooves take #10-32 screws for the Starbeam, Piggy-Cam and Sol-Searcher. For alt-az use, the Gibraltar-HD or Gibraltar5-HD are recommended for their sturdy legs, and Tele Vue makes adapter plates for popular \u003ca href=\"\/en-us\/collections\/equatorial-mounts\"\u003eGerman equatorial 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\u003eVisual Astronomy: A 4.9° Maximum Field of View\u003c\/h3\u003e\n\u003cp\u003eThe NP101is excels as a visual instrument, offering a magnification range from 10x to a recommended maximum of 250x. At its lowest power with a 2\" 55mm Plössl or 41mm Panoptic eyepiece, it delivers a 4.9° true field at 9.8x or 13.2x, enough to frame the Andromeda Galaxy (M31) or sweep the star fields of the Milky Way.\u003c\/p\u003e\n\u003cp\u003eIn Tele Vue's words, the highly corrected wide, flat field and fast focal ratio put eyepieces to the test, which is why the NP line has long been Tele Vue's own eyepiece test bed. At higher power, the virtually ideal color correction shows Jupiter's cloud bands and the Cassini Division in Saturn's rings without a color fringe.\u003c\/p\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\/5.4 and f\/4.3 with 52mm Sensor Coverage\u003c\/h3\u003e\n\u003cp\u003eThe \"is\" in NP101is stands for Imaging System, and this telescope is an astrophotographer's tool. At its native 540mm focal length and f\/5.4 ratio, it produces a 5.3° image circle, and Tele Vue designed the focuser to light chips up to a 52mm diagonal. For even wider fields, the optional NPR-2073 0.8x reducer transforms the scope into a 432mm f\/4.3 \u003ca href=\"\/en-us\/collections\/astrograph-telescopes\"\u003eastrograph\u003c\/a\u003e, capable of covering full-frame (43mm) sensors.\u003c\/p\u003e\n\u003cp\u003eImaging System accessories thread together from the focuser's imaging insert to the camera. For 35mm and larger formats, or any sensor with pixels under 6µm, use the LCL-1069 Large Field Corrector for the best edge sharpness, set 2.75\" (69.85mm) from the camera sensor (2.67\" for 53mm-diagonal sensors). With the NPR-2073, the back focus is 68mm for one-shot-color and DSLR cameras, or 50mm for full-frame monochrome with filters, and spacers that keep drawtube extension to about 0.75\" (20mm) are recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSighting with the 540mm OTA: Pointing and Finding\u003c\/h3\u003e\n\u003cp\u003eThe wide field of the NP101is makes it easier to locate objects than a long-focus telescope, but a reliable \u003ca href=\"\/en-us\/collections\/finder-scopes\"\u003efinder\u003c\/a\u003e is still essential. Tele Vue particularly recommends the Starbeam reflex sight (SRT-2010), which attaches to the Ring Mount or \u003ca href=\"\/en-us\/collections\/rings\"\u003eTube Rings\u003c\/a\u003e and fits a cutout in the case. Remove it before any solar observing.\u003c\/p\u003e\n\u003cp\u003eAlternatively, you can use the telescope itself as its own finder. By inserting a low-power, wide-field eyepiece like a 55mm Plössl, the NP101is operates at 10x magnification with a 4.9° field. That is wide enough to star-hop to bright deep-sky targets. For those who prefer a traditional finderscope, the Quick Release Universal Finder Bracket (QFM-1008) also attaches to the mounting 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\u003eExpanding the NP101is with the 2.4\" Imaging System\u003c\/h3\u003e\n\u003cp\u003eTele Vue designed its Imaging System accessories with each optical system, so they are matched to this telescope. Everything threads onto the included Imaging System Adapter, which replaces the 2\" Accessory Adapter in the 2.4\" drawtube.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducers \u0026amp; Correctors:\u003c\/strong\u003e The NPR-2073 0.8x Reducer provides a wider, faster f\/4.3 system, while the LCL-1069 Large Field Corrector optimizes edge performance on 35mm and larger formats and on cameras with pixels under 6µm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Adapters:\u003c\/strong\u003e Tele Vue offers a range of threaded adapters, including standard T-rings (TRG-1072), wide T-adapters for Canon (CWT-2070) and Nikon (NWT-2073), and an M54 adapter (M54-1073) for full-frame cameras and \u003ca href=\"\/en-us\/collections\/filter-wheels\"\u003efilter wheels\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpacers:\u003c\/strong\u003e The TLS-2245 set holds all six spacer rings (0.25\", 0.375\", 0.5\", 1.0\" threaded, plus 0.040\" and 0.080\" rings that fit between them), in black anodized aluminum with anti-reflection threads. The AFT-1105 adapter takes 48mm filters and adds 0.25\" of spacing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnifiers:\u003c\/strong\u003e The 2x (PMT-2200) and 4x (PMT-4201) Powermates are recommended, used with the 2\" Accessory Adapter, the matching T-ring adapter (PTR-2200 or PTR-4201) and the 3.5\" extension tube.\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\u003eNP101is vs. the TV-85 and NP127is: Choosing Your Tele Vue\u003c\/h3\u003e\n\u003cp\u003eThe NP101is sits in a strategic position within the Tele Vue lineup, balancing aperture, portability, and field of view. Understanding its siblings helps clarify where it excels.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue-85:\u003c\/strong\u003e The TV-85 is significantly more portable, with a 600mm f\/7 doublet objective. Tele Vue pitches it as small enough for an airline carry-on. The NP101is has about 43% more light-gathering area, a faster f\/5.4 focal ratio and a flat field for imaging, at the cost of more size and weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue-NP127is:\u003c\/strong\u003e The NP127is is the larger sibling, boasting a 127mm Nagler-Petzval objective. It gathers 58% more light than the NP101is and has a slightly faster f\/5.2 focal ratio. While visually more powerful, the NP127is is a heavier and longer instrument (14.5 lbs), requiring a more substantial mount. The NP101is gives you the same imaging system in a lighter 10.7 lb tube.\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 Note on Used Condition\u003c\/h3\u003e\n\u003cp\u003eThis Tele Vue TV-NP101is is a used telescope in good condition, sold as a complete imaging package. Along with the optical tube, it comes with a Tele Vue Qwik Point finder, both matching Tele Vue correctors (the NPR-2073 0.8x reducer and the LCL-1069 Large Field Corrector), a Feather Touch Focus Boss II controller with hand control and HSM focus motor, a Tele Vue Imaging System adapter kit with T-ring adapter, spacers and shims, tube rings, a dovetail plate and a hard case. This used telescope is sold without warranty. It is a single unit: once it is sold, it is gone.\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 Tele Vue NP101is a \"flat field\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe NP101is uses a 4-element Nagler-Petzval optical design. Many doublet and triplet refractors need a separate field flattener for imaging. In the Nagler-Petzval layout, a rear doublet widely spaced from the front doublet is part of the objective itself and flattens the field. Tele Vue only adds the LCL-1069 corrector for 35mm and larger formats or pixels under 6µm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the NP101is for visual astronomy, or is it just for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is a full visual instrument as well as an imager. Its fast f\/5.4 focal ratio and 101mm aperture deliver bright, wide-field views of large deep-sky objects. With a 2\" 55mm Plössl eyepiece, you reach a 4.9° true field. At the same time, its 1.1 arc-second resolution and color correction hold up on planets and double stars at high power.\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 Tele Vue NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optical tube weighs 10.7 lbs. For alt-az use, the Gibraltar-HD or Gibraltar5-HD are recommended for their sturdy legs, with the RS4-8004 ring. For imaging, the MRS-4011 dual ring set is best suited, and Tele Vue makes adapter plates for popular German equatorial mounts; size the mount for the tube plus your camera train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the optional 0.8x reducer (NPR-2073) change the NP101is's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe NPR-2073 reducer converts the NP101is into a faster, wider imaging system. It changes the telescope's specifications from 540mm at f\/5.4 to 432mm at f\/4.3. This 25% wider field of view is ideal for capturing large nebulae like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31) on a full-frame sensor, and f\/4.3 needs about 64% of the exposure time of f\/5.4 for the same signal on extended objects.\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 focuser's tilt adjustment on the NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe end ring is pre-set parallel to the focal plane. If your images show tilt, find the part of the field that reaches focus first when racking out, loosen the three jam screws, jack the end ring out to match it (a quarter turn moves 198 microns), then lock it. Make these adjustments during an imaging session, by trial and error.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need extension tubes to reach focus with the NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use with a standard 2\" diagonal, the NP101is will reach focus with all Tele Vue eyepieces without any extensions. For imaging, it depends on your specific camera and accessories. The manual recommends threaded extension spacers that limit drawtube extension to about 0.75\" (20mm). You will need to calculate the required spacing based on your camera's back-focus distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the best eyepiece for viewing the Orion Nebula (M42) with the NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo frame the entire Orion Nebula complex, from the Trapezium core to the fainter outer loops, a wide-field, low-power eyepiece is best. A Tele Vue 27mm Panoptic would yield 20x magnification and a 3.2° true field, easily containing the nebula. For a more immersive \"spacewalk\" view, a 17mm Ethos would provide 32x and a 3.1° field, darkening the sky background and enhancing contrast on the faint nebulosity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the NP101is require collimation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo user collimation is needed. The front doublet is aligned at the factory with three alignment screws that you should never touch; contact Tele Vue if the scope ever needs re-collimation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the included hard case suitable for airline travel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe custom hard-shell case is built for carrying and storage: the telescope in its case weighs 19 lbs. Always keep the two accessory bags in the lid when carrying, because they hold the telescope down; Tele Vue does not state airline suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the focuser hold 12 lbs without slipping?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEach focuser is tested to hold 12 lb without flex. Two tension screws on top of the focuser body press on a brass clamp ring, which cinches down on the drawtube's Teflon sleeve. This allows you to add significant resistance to prevent slipping under heavy loads, and even when tight, the knobs, including the 10:1 Focusmate, can still drive the draw tube. Tighten the two screws in unison to avoid focus shift.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eU-MAR-TV-NP101IS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eTV-NP101is (NPI-4057)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eAPO (Nagler-Petzval) Refractor, 4 elements \/ 2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e101mm\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\/5.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength (OTA)\u003c\/td\u003e\n\u003ctd\u003e25.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength with 2\" Diagonal\u003c\/td\u003e\n\u003ctd\u003e28.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (OTA)\u003c\/td\u003e\n\u003ctd\u003e10.7 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.4\" Focusmate dual-speed rack and pinion (10:1); 3\" entrance \/ 2.4\" exit aperture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Visual Field\u003c\/td\u003e\n\u003ctd\u003e4.9° (with 2\" 55mm Plössl or 41mm Panoptic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Recommended Power\u003c\/td\u003e\n\u003ctd\u003e250x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e4\" (101.6mm)\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\u003eMatching Flattener \/ Reducer\u003c\/td\u003e\n\u003ctd\u003eLCL-1069 Large Field Corrector, NPR-2073 0.8x Reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e4 inches (101.6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003efully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Gain\u003c\/td\u003e\n\u003ctd\u003e211x (compared to a 7mm exit pupil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (visual)\u003c\/td\u003e\n\u003ctd\u003e1.1 arc-sec (Dawes limit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (photographic)\u003c\/td\u003e\n\u003ctd\u003e267 line pairs per mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Range\u003c\/td\u003e\n\u003ctd\u003e10x to 270x with Tele Vue eyepieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight in Case\u003c\/td\u003e\n\u003ctd\u003e19 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle (prime focus)\u003c\/td\u003e\n\u003ctd\u003e5.3° (televue.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Coverage\u003c\/td\u003e\n\u003ctd\u003eup to 52mm diagonal (televue.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Payload\u003c\/td\u003e\n\u003ctd\u003etested to hold 12 lb without flex (televue.com)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube\u003c\/td\u003e\n\u003ctd\u003epowder-coated aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWith NPR-2073 0.8x Reducer\u003c\/td\u003e\n\u003ctd\u003e432mm, f\/4.3, up to 43mm (full frame) sensors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003ePetzval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eUsed, good condition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eNone (sold as is)\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\"\u003eUsed Tele Vue TV-NP101is 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\"\u003eImaging System Insert (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\"\u003e2\" Accessory Insert\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\"\u003eFocusmate 10:1 Dual-Speed 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\"\u003eSliding Metal Dew Shield (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\"\u003eScrew-on Metal 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\"\u003eHard-Shell 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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Keys for End Ring Tilt Adjustment\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\"\u003eTele Vue Qwik Point 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\"\u003eTele Vue NPR-2073 0.8x Reducer for Flat-Field Telescopes\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\"\u003eTele Vue LCL-1069 Large Field Corrector\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\"\u003eFeather Touch Focus Boss II Dual Focuser Controller with Hand Control\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\"\u003eFeather Touch HSM Focus Motor\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\"\u003eTele Vue Imaging System Adapter Kit with T-Ring Adapter, Spacers and Shims\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× 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\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\/Tele_Vue_NP101is_Operating_Guide.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\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":67993558384925,"sku":"U-MAR-TV-NP101IS","price":3428.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/tele-vue-tv-np101is-ota-used-1.jpg?v=1794079989","url":"https:\/\/davidastro.com\/en-us\/products\/tele-vue-tv-np101is-ota-used","provider":"David Astro","version":"1.0","type":"link"}