GoldFocus - Schmidt Cassegrain Collimation
Secondary mirror size - Meade LB 16 f4.5 vs ES 16 f4.5 - Reflectors - Cloudy Nights
Secondary Mirror Replacement, Offset, Collimation, Testing - Deep Sky Watch
How to Simply Calculate the Secondary Mirror Size – Astro Khan Telescope Making
Newtonian Reflecting Telescope Designer
Newtonian Reflecting Telescope Designer
What should be the distance between secondary mirror and the eyepiece in Newtonian telescope? - Quora
Secondary Mirror Replacement, Offset, Collimation, Testing - Deep Sky Watch
Building an open-tubed 12.5" F/12.5 Classical Cassegrain
Sizing Up the Newtonian Secondary - Gary Seronik
Two-mirror telescopes: Cassegrain, Gregorian and variants
Practical Calculations for Designing a Newtonian Telescope
Sky & Telescope
Build a Backyard Dobsonian Telescope
Newtonian Reflecting Telescope Designer
Two-mirror telescope aberrations
Practical Calculations for Designing a Newtonian Telescope
Sizing your diagonal
Offsetting Your Secondary Mirror - Sky & Telescope - Sky & Telescope
A Treatise on Newtonian Collimation (Text)
Trying to find the best secondary mirror size for my project - ATM, Optics and DIY Forum - Cloudy Nights
What should be the distance between secondary mirror and the eyepiece in Newtonian telescope? - Quora
Secondary A B C Specs
Secondary Mirror Replacement, Offset, Collimation, Testing - Deep Sky Watch
