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| These large finderscope/photoguide telescope mounting rings mount a short focal length refractor optical tube or a small catadioptric telescope on an optional Losmandy D-series dovetail plate. They let you use the second scope as a high power/variable power finderscope for your larger telescope; as a photoguide scope for long exposure deep sky photography; and as an astrograph. The rings are sold as a pair only. They have a nominal 110mm (4.33") internal diameter and will hold optical tubes with an o. d. of 2.45" to 4.25". Optical tubes with the latter tube o.d. are a very tight fit and allow for very little collimation range. A 4" o.d. tube would be a more reasonable maximum. There are three large hand-tighten adjustment screws with non-marring Delrin tips in each ring. These allow you to collimate the refractor with the main scope optics when it is used as a finderscope, or to aim the refractor off-axis to locate an appropriate guide star or photographic target when it is used as a photoguide or astrograph. The rings weigh 2 lbs and 3 ounces per set. The height from the top of the dovetail plate to the center of the rings is 3.6". They mount on a Losmandy D-series dovetail plate with no tools required.
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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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