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| This short focal length eyepiece has been designed by Thomas M. Back, noted refractor designer, to give you exceptional high power views with a wide variety of telescope types and focal ratios – even under so-so seeing conditions. It will work with f/10 to f/15 catadioptric scopes, as well as 80mm f/6 refractors. And it will work with any telescope type in between. It has been optimized to view bright objects, both on and off axis, while showing maximum detail and definition. It has very high light transmission, very high contrast, minimal lateral color, and minimal light scatter. For Dobsonian users and others without tracking drives, the very low lateral color and other aberrations allow a planet to drift across the entire 60° field while still being sharp and having high contrast, thereby maximizing observing time. While the eyepiece is optimized for observing subtle lunar and planetary detail, its high resolution and high contrast work equally well for splitting binary stars, resolving compact globular clusters, etc.
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Toll-Free Telephone: 800-422-7876
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Saturday Noon - 5 PM CST
Store Hours: Monday-Friday 9 AM - 5 PM CST
Saturday Noon - 5 PM CST
First Telescope
680 S.W. 24th Ave.
Norman, OK, 73069
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