These large finderscope/photoguide telescope mounting rings mount a short focal length refractor optical tube on an optional Losmandy D-series dovetail plate. They let you use the refractor as a high power/variable power finderscope for your larger telescope; as a photoguide scope for long exposure deep sky photography; and as a widefield astrograph. The rings are sold as a pair only.
They have a nominal 95mm (3.75”) internal diameter and will hold optical tubes with an o. d. of 2.5” to 3.5”. 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 black-anodized rings weigh 1 lb and 4 ounces per set. The height from the top of a Losmandy D-style dovetail plate to the center of the rings is 3.6”. With a Vixen-style dovetail, the height is 3.3" They mount on each dovetail plate with no tools required.
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