Alpine Astronomical assembled three components of their T-2 Astro modular accessory system into a single, highly useful diagonal for 1.25" focusers and accessories: the Baader Zenith Prism Star Diagonal. You get a 1.25" holder, a highly-reflective star diagonal, and a nosepiece that is threaded for filters.
A part of their modular Astro T-2 system, the Alpine Astronomical Baader T-2 90° Prism Star Diagonal Housing is offered in this configuration to give you complete customization options for a range of applications. The 32mm clear aperture mirror diagonal housing has T2 male threads on one side and T2 female threads on the other. These are compatible with the Astro T-2 family of accessories, from photo and imaging adapters to eyepiece holders, ClickLock holders, nose pieces, and more. Highly reflective mirror coatings limit light loss to ensure images remain bright and clear, while the simple mirror design corrects images horizontally but leaves them laterally inverted.
Part of their T-2 Astro modular accessory system, the Alpine Astronomical Baader Deluxe 1.25" / T-2 Eyepiece Holder is designed to provide a reliable and simple way to hold your eyepieces, diagonals, Barlows, or other accessories.
It is made with tight tolerances to minimize sloppiness and has three clamp screws to ensure the eyepiece is centered and accurately optically aligned, with a bronze compression ring to hold your gear without marking or marring the nosepiece. To help ensure tack-sharp images, the holder has a micro-focusing mechanism with 5mm of travel and a lock to set the focus. Standard T-2 internal (female) threads are machined into the telescope side of the holder.
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.