Alpine Astronomical Baader Double-T Filter Holder

This filter holder allows 1.25" filters to be used with a Bino-Viewer or Camera External T-Mount. It features internal M28.5 threads and accepts standard 1.25" astro filters. The holder is designed for mounting standard 1.25" astronomical eyepiece filters onto Baader bino-viewers, enabling binocular telescope viewing without needing two of every filter or complete sets of larger-diameter filters. One side has double T-mounts with external male T-mount threads and internal M28.5 threads, while the other end has standard female 1.25" filter threads.