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| These proprietary eyepieces use either five lenses (in the 5mm) or six lenses (in the 2.5mm) in a three-group design to achieve a sharpness and contrast that is exceptional in high magnification eyepieces. Their chrome barrels are threaded for standard 1.25” filters. A safety groove cut into the chrome barrel engages the thumbscrew of the focuser to keep the eyepiece from falling if the thumbscrew accidentally loosens during use. Both are multicoated on all air/glass surfaces, using proprietary Pentax Super Multi-Coatings (SMC). The edges of the lenses have been blackened to eliminate internal reflections for better contrast. Both use high-refraction, low-dispersion lanthanum (rare earth) lenses to minimize chromatic aberrations and astigmatism. They can be used with all telescope types, and are optically corrected for use with focal ratios as fast as f/4. They have exceptional contrast and excellent center to edge sharpness, with very little ghosting, for critical lunar, planetary, and binary star observing. They are weatherproof to JIS Class 4 standards (which means that dew accumulation won’t cause a problem, although full submersion in a bucket of water is a no-no). Each eyepiece comes with plastic dust caps for the barrel and eye lens and a bolt-type plastic container for storage. They are protected against flaws in materials or workmanship by a lifetime warranty, a rarity in telescope equipment. |
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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 8 AM - 6 PM CST
Tuesday-Friday 8 AM - 8 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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