Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Telescope magnification
Formula to estimate exposure from aperture & F ratio - Beginning Deep Sky Imaging - Cloudy Nights
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Thiery Legault - How to adjust the focal length ?
Telescope Focal Length: Everything You Need To Know
How to Choose Eyepieces for Your Astronomy Telescope
How to Choose Your Telescope Magnification - Sky & Telescope - Sky & Telescope
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Refractive Telescopes
Effective Focal Length Calculator - Landscape Photography | Real Estate Photography
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Two-mirror telescopes: Cassegrain, Gregorian and variants
Telescope Equations: Magnification
Thiery Legault - How to adjust the focal length ?
Telescope stats explained | BBC Sky at Night Magazine
Telescopes and Microscopes
Telescope Equations: Minimum Magnification
what telescope should i look for?
Refractive Telescopes
Telescope Focal Length Explained: Why Does It Matter? | StarLust
Formulas - Telescope Magnification
astronomical optics, part 2: telescope & eyepiece combined
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
Telescope Magnification Calculator
Telescope Equations
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
