These split and hinged TMB 90mm i.d. optical tube mounting rings are made of solid aluminum, anodized black for long life. They are felt-lined and have a large hand-tighten knob to lock them on your optical tube. A heavy nylon washer prevents the knob from marring the anodized finish. The rings have a 90mm (3.5”) internal diameter designed to fit the TMB92L triplet apo refractor, but will also fit any refractor with a 90mm OD tube, such as the Astro-Tech AT80 and all William Optics 80mm telescopes (all versions of the Megrez 80 and ZenithStar 80, for example), plus any other scope with a 90mm OD tube. The rings weigh 13 oz. each.
There are five 1/4”-20 thread mounting holes on bottom of the rings for mounting on most equatorial mount dovetail plates. One hole is centered in the flat mounting boss in the bottom of each ring. It is flanked by a pair of holes on 60mm centers, and a second wider pair of holes on 80mm centers. An identical set of five holes on the top of each ring allow installing a second dovetail plate to carry accessories.
Two 16mm (5/8”) long x 1/4”-20 thread mounting hex head bolts are supplied with each ring for mounting the ring on a dovetail plate or equatorial mount using the center hole or either two of the two flanking holes.
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