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 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 160mm (6.3”) internal diameter and will hold
optical tubes with an o. d. of 5” to 6.3”. Optical tubes with the latter
tube o.d. are a tight fit and allow for very little collimation range. A
5.75” i.d would be a more reasonable maximum size 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 3.5 pounds per set. The height from
the top of a Losmandy D-series dovetail plate to the center of the rings is 5.1”. With a Vixen-style dovetail, the height is 4.8". They
mount on each dovetail plate with no tools required.
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