Sky and Telescope gave the original TMB92 "4.5 Stars" and named this lighter, but optically identical, TMB92L a Hot Product for 2010. And Astronomy named it a Star Product for 2010 award winner. Same "4.5 star" triplet apochromatic ED optics, in a lighter tube, and at a lighter price. What's not to love? . . .
These 142mm split mounting rings are designed to fit the Astro-Tech AT130 and TMB TMB-130 refractors, as well as any other refractor having a 142mm OD tube . . .
These mounting rings fit the TMB92L triplet apo refractor, as well as any other refractor with a 90mm OD tube such as the Astro-Tech AT80 and all William Optics 80mm telescopes (Megrez 80 and ZenithStar 80, for example) . . .