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A short focal length eyepiece with a very wide field and exceptionally long eye relief for eyeglass use. It is designed for unvignetted medium power viewing with short focal length refractors and fast focal ratio/short focal length reflectors. It is more or less regularly useful for high magnification viewing with long focal length scopes, such as Schmidt-Cassegrains, but below average seeing conditions may limit its performance. If so-so seeing is the norm where you observe, its 8mm focal length may represent the maximum practical power with a long focal length scope. Because it is corrected for use with scopes as fast as f/4, it works well with large Dobsonian telescopes for resolving globular clusters and compact galaxies and planetary nebulas. Even with a 17" f/4.5, it yields a 0.26 degree field of view at 242x, over half the diameter of the full Moon. Globulars such as M13 and M22 fill the eyepiece field in such a scope.
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Terms of Sale | PRIVACY POLICY 7/1/2004 | Fine Print
Toll-Free Telephone Astronomics: 800-422-7876; Christophers, Ltd.: 800-356-6603
Alternate Telephone: 405-364-0858 24 Hour Fax Line: 405-447-3337
Telephone Hours: Monday-Friday 8 AM - 9 PM CST
Saturday Noon - 5 PM CST
Store Hours: Monday-Friday 9 AM - 5 PM CST
Saturday Noon - 5 PM CST
Astronomics / Christophers, Ltd.
680 S.W. 24th Ave.
Norman, OK, 73069
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