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| This very short focal length eyepiece has been designed by Thomas M. Back, noted refractor designer, to give you exceptional high power views with short focal length/fast focal ratio refractors and reflectors – even under so-so seeing conditions. It will work with f/10 catadioptric scopes, but its tiny quarter-millimeter exit pupil and very dim images with such scopes make it exceedingly difficult to use. 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.
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