Alpine Astronomical Baader 36.4mm Male Thread to 1.25" Eyepiece Holder

Part of the T-2 Astro modular mounting system, the Alpine Astronomical Baader 36.4mm Male Thread to 1.25" Eyepiece Holder allows you to use standard 1.25" eyepieces and accessories on focusing tubes that terminate with female 36.4mm threads�including certain Vixen, Takahashi, and Lichtenknecker models. It features a non-marking or marring compression ring with three set screws that hold the eyepiece firmly in place, as in a conventional holder, but this one gets an improvement from Baader with a secondary rotating collar that allows you to adjust the back optical distance from 29 to 35.5mm so you can fine-tune the back-focus distance depending on your optical tube, focusing system, and application.