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these Newtonians also produce bright and detailed viewing for visual astronomy
both published by Farcountry Press
This includes a dew shield
4 Lowest Useful Magnification 34 x Magnification of Eyepiece 1 102 x Optical Coatings StarBright XLT Optical Design EdgeHD Optical Tube Aluminum Optical Tube Length 22 in (559 mm) Optical Tube Weight 21 lbs (9
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71F Flat-Field New Product these Newtonians also produce brightThe Askar 71F is an OTA with an aperture of 71mm, a focal length of 490mm, and a native focal ratio of F6. 9. The Askar 71F adopts a quadruplet air spaced APO lens design, including one piece of ED glass which can effectively reduce chromatic aberration. The Askar 71F supports 44mm full frame imaging with great performance of the surrounding star points. The Askar 71F is a self flattened design that allows users to avoid calculating the back focus and
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