Part of the Astro T-2 Modular System For 1.25″ Focusers & Accessories T-2 Mount for Multiple Accessories Threaded for Eyepiece Filters An optional part of their modular Astro T-2 system, the Alpine Astronomical Baader 1.25″ T-2 Nosepiece allows an array of accessories and eyepieces to fit into 1.25″ drawtubes, focusers, and visual backs. The nosepiece has M34 threads that accept the Baader VIP Barlow Lens or Glasspath Compensator. It also has male T-2 threads, which allow you to mount your T-2 accessories like the Baader Amici prism as well as a DSLR or imager for afocal and ocular projection photography techniques.