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 therefore a wider area of sky in which to find a guide star.

The ring set has a total weight of 1.85 lbs. Each ring weighs 14.8 ounces, including its attached #ATVA adapter. The height from the top of the main scope’s dovetail plate (not the top of the #ATVA adapter) to the center of the rings is 2.9” (73mm). The rings and adapters are hard anodized matte black for good looks and durability.