Amazon.com : Explore Scientific Diagonal Mirror 2 Inches with 99% Reflection for Telescopes with 2 Inch Eyepiece Extension : Electronics
Amazon.com : Alstar SCT Adapter for 2" SCT Diagonals - Convert Compatible Push-in (Refractor) Type diagonals into a Standard SCT Diagonal : Electronics
How does a Schmidt-Cassegrain telescope work? - Quora
field orientation
Tele Vue Optics: Diagonals & Prisms
Your experience with Tele Vue 45-degree Erect Image Prism Diagonal (AMI-0011) and 60-degree Everbrite Diagonal (DPC-6012) with small apo refractors? - Page 2 - Refractors - Cloudy Nights
Celestron 2" Diagonal with XLT Coatings for Schmidt Cassegrain Telescopes - 93527