Schmidt-Cassegrains — Starizona
h-alpha and white light sun images
The Big Red One: My Optimized 6-inch f/9 Reflector - Gary Seronik
Optical system of a telescope
Aperture, f-ratios, myths, etc. | Ask Craig | Stark Labs
astronomical optics, part 2: telescope & eyepiece combined
Which Telescope is Best for Me? — Starizona
Telescope Equations: Magnification
What is Focal Length – Distance Light Travels in Telescopes
Two-mirror telescopes: Cassegrain, Gregorian and variants
Lecture 7: Optics and Telescopes
what telescope should i look for?
Focal Ratio vs. Aperture: What Makes an Object Look Brighter Through a Telescope? - Sky & Telescope - Sky & Telescope
f-number - Wikipedia
Telescope Equations: Magnification
Optics for Astronomy
Please explain focal ratio vs. exposure time - Beginning Deep Sky Imaging - Cloudy Nights
How Focal Ratio Affects Your Astro Images - Sky & Telescope - Sky & Telescope
Telescope Astronomy Physics - Notes
Confused with scope focal length - what am I missing? - Beginners Forum (No astrophotography) - Cloudy Nights
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Tele Vue Optics: Imaging Methods
