In addition, there are 15 internal knife-edge baffles installed down the interior length of the optical tube to eliminate any stray light that might get past the extended optical tube and lower the contrast. ![]() Alternatively, the fan can be powered by a 12 VDC rechargeable battery if one is being used to power your mount's drive system.Įxtended optical tube with 15 internal baffles: To increase the contrast, the optical tube of the Astro-Tech AT8IN is extended 8.75" forward of the focuser centerline to act as a lens shade to keep ambient light from hitting the diagonal mirror. The fan is powered by a supplied battery pack that uses eight user-supplied AA batteries. The Sky & Telescope review praised the "solidly made" primary mirror cell and secondary mirror holder.īuilt-in cooling fan: A low-vibration/high CFM fan is mounted on the primary mirror cell. To further ease collimation, the primary mirror is precisely center-spotted. These make it easy to collimate the primary mirror without tools, even while wearing gloves or mittens in cold weather. No-tool push-pull mirror cell: The die-cast aluminum primary mirror cell has six large hand adjust push-pull collimation knobs. For maximum contrast, the four secondary mirror spider vanes have been optimized to be as thin as possible without losing stability. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. B270 glass is equivalent to BK7 in performance and optical quality. The mirrors are made of B270 "water white" optical crown glass that is free of internal stress and striae. The mirrors are ground and polished under computer control for guaranteed diffraction limited performance, coated with 91% reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life. Newtonian reflector optics: 8" aperture, 800mm focal length, f/4 focal ratio, parabolic primary mirror 70mm m.a. This Astro-Tech Telescope's Optical System. Simply add optional 1.25" or 2" eyepieces, and perhaps an optional Barlow lens, and this Astro-Tech Imaging Newtonian will provide you with crisp and sharply detailed close-up views of the Moon and planets. However, the visual performance will still be much more than acceptable, and the 800mm focal length of this Astro-Tech makes it quite possible to achieve the high powers needed for detailed lunar and planetary observing. Solar system visual contrast will be somewhat reduced compared to a longer focal ratio reflector because of the AT8IN's larger secondary mirror that has been optimized for full-field photographic illumination. In addition to deep space imaging, the Astro-Tech AT8IN is also usable for solar system imaging as well as deep space and solar system visual observing. The light weight standard equipment mounting rings of the Astro-Tech Imaging Newtonian allow you to use it on a wide variety of dovetail plates and German equatorial mounts - from the most basic to the most elaborate high payload go-to system. a versatile instrument that will take you into the depths of the universe in style." It can be used with 35mm cameras, DSLRs, web-cams, DSI-type cameras, and large format CCD cameras alike.Īstronomy named the Astro-Tech AT8IN a Star Product for 2010, saying "Astronomy Technologies has optimized the AT8IN for astroimaging, but the scope is just as adept for backyard viewing. This 8" Astro-Tech AT8IN optical tube is a very fast focal ratio f/4 reflector that has been optimized for wide field deep space imaging. 8 x 50mm finderscope in a quick-release bracket.2" dual-speed Crayford focuser with 2" and 1.25" compression ring accessory adapters.built-in cooling fan for faster primary mirror cooldown. ![]() ![]()
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