Astro Tech 110mm Ring Set for Vixen Style Dovetail, Black ATVR110 Reviews
Astro Tech ATVR110
This Astro-Tech 110mm finderscope/photoguide ring set allows you to mount an 80mm to 100mm refractor optical tube on an optional Vixen-style dovetail plate that has been installed piggyback on a larger telescope. The set lets you use the small refractor as a high power/variable power finderscope for your larger telescope; as a photoguide scope for long exposure deep sky photography; or as a wide field astrograph that is guided through the main scope.
The Astro-Tech 110mm ring set consists of two 110mm i.d. rings mounted on Astro-Tech #ATVA Vixen-style dovetail adapters. A single hand-tighten knob clamps each Astro-Tech #ATVA adapter firmly in place on your Vixen-style dovetail, but allows the rings to be quickly repositioned along the dovetail so you can balance your smaller scope fore and aft as needed with no tools required.
There are three hand-tighten adjustment screws with non-marring Delrin tips in each ring. These allow you to collimate the small 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 have a nominal 110mm (4.33") internal diameter and will hold small refractor optical tubes with an o.d. of 80mm to 100mm. This size range allows the small refractor to be collimated with the main scope (if the refractor is being used as a finderscope), while still allowing for a reasonable amount of off-axis aiming to find a guide star (if the refractor is being used as a photoguide).
The larger the o.d. of your small refractor, however, the less off-axis aiming capability you will have for guiding. If your small refractor has an o.d. close to 100mm, you might be best served by going to the next larger guidescope ring size (125mm) to give you more off-axis aiming capability and t
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Jul 24, 2011 19:57:04
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