f-number - Wikipedia
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
How to Calculate Telescope Magnification
Astro Tutorial #1.6: THE F-RATIO "fast" vs "slow" scopes - YouTube
Telescope Equations: Magnification
Two-mirror telescope aberrations
Aperture Area Calculator
Telescope magnification
How Telescopes Form Images - Video & Lesson Transcript | Study.com
How to Choose Eyepieces for Your Astronomy Telescope
Newtonian Telescope - Wolfram Demonstrations Project
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
How Telescopes Form Images - Video & Lesson Transcript | Study.com
Cassegrain Formulas and Tips by Mike Lockwood
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Telescope Equations: Magnification
Telescope Magnification - YouTube
Telescope Equations: Minimum Magnification
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Refractive Telescopes
Refractive Telescopes
Telescope stats explained | BBC Sky at Night Magazine
Telescope Focal Length: Everything You Need To Know
Aperture, focal length and focal ratio - Optics Trade Blog
