For many years, Baader Planetarium offered just a small handful of premium quality star diagonals. Over the past few years, however, they have introduced the innovative T-2 system of diagonals and accessories along with a half-dozen otherdiagonals to the product mix. There are now some 13different Baader diagonals in production, which offers amateur astronomers a wide range of choice and configurations.

Because all the light from your telescope objective is reflected by your star diagonal, the choice of a star diagonal is at least as important as the choice of eyepiece. Baader makes excellent diagonals, but with so many choices, it might be hard to figure out which diagonal is right for your situation. Should you choose adiagonal with a right-angle prism or Amici prism? Or 45-degree or 90-degree viewing angle? How about Maxbright or BBHS coatings? Or T-2, 1.25", or 2" diagonal? Baader or Zeiss prism? If you’re confused, you’re not alone. We were too. That’s why we sat down to sort out all the options and developed thisguide that we hope will help you navigate the Baader diagonal landscape and pick the diagonal for your telescope and observing interests.This guide will examine both the various physical configuration of Baader diagonals and the options for reflective mechanisms by which the diagonal does its job of directing light from the objective lens into your eyepiece.

Read the full Guide here: https://agenaastro.com/choosing-a-baader-diagonal.html