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 or Vixen-style 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 108mm (4.25”) internal diameter and will hold
optical tubes with an o. d. of 2.95” to 4.25”. Optical tubes with the
latter tube o.d. are a very tight fit and allow for very little
collimation range. A 3.75” 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 black-anodized rings weigh 1.875 pounds per set. The height from
the top of a Losmandy D-series dovetail plate to the center of the rings is 3.95”. With a Vixen-style dovetail the height is 3.65". They
mount on each Losmandy or Vixen-style dovetail plate with no tools required.
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