astronomical optics, part 2: telescope & eyepiece combined
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Thiery Legault - How to adjust the focal length ?
Telescope Equations
How to Choose Eyepieces for Your Astronomy Telescope
Formula to estimate exposure from aperture & F ratio - Beginning Deep Sky Imaging - Cloudy Nights
Thiery Legault - How to adjust the focal length ?
Two-mirror telescopes: Cassegrain, Gregorian and variants
Refractive Telescopes
Telescope Equations: Minimum Magnification
How to Choose Your Telescope Magnification - Sky & Telescope - Sky & Telescope
what telescope should i look for?
Tele Vue Optics: The Majesty Factor
Refractive Telescopes
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
Telescope stats explained | BBC Sky at Night Magazine
Formulas - Telescope Magnification
Lowest and highest useful magnification - Optics Trade Blog
Telescope magnification
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Telescope Equations: Magnification
Telescope Equations: Magnification
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
