Lecture 3
h-alpha and white light sun images
Telescope stats explained - BBC Sky at Night Magazine
f-ratio myth
Astrophotography, Pixel by Pixel: Part 2 - Focal Ratio Effects – Cloud Break Optics
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Choosing your first telescope @ Meade Instruments UK
Focal Ratio vs. Aperture: What Makes an Object Look Brighter Through a Telescope? - Sky & Telescope - Sky & Telescope
Focal length in detail - Beginners Forum (No Astrophotography) - Cloudy Nights
Telescope Focal Ratio Explained | Telescope Live
Choosing a Telescope for EAA
Astro Tutorial #1.6: THE F-RATIO "fast" vs "slow" scopes - YouTube
Telescope Focal Ratio Explained - YouTube
Optics - Telescope-in-a-box - Wiki.nus
The Big Red One: My Optimized 6-inch f/9 Reflector - Gary Seronik
What is Focal Length – Distance Light Travels in Telescopes
Telescope Focal Ratio: Explanation (F Ratio & F-Number) - Telescope Nerd
60mm Guide Scope Finderscope for Astronomical Telescope 240mm Focal Length F4 Focal Ratio Guidescope with Helical Focuser - Walmart.com
Telescope Focal Length: Explanation - Telescope Nerd
focal ratio - Society for Popular Astronomy
Telescope Focal Ratio: Explanation (F Ratio & F-Number) - Telescope Nerd
Telescopes: Focal ratio, plane and telescope types - YouTube
Most Important Telescope Specs Explained for Beginners – Night Sky Gazing
Optical system of a telescope
