Telescope magnification
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Lowest and highest useful magnification - Optics Trade Blog
astronomical optics, part 2: telescope & eyepiece combined
Telescope Magnification Calculator - Calculator Academy
NASA - Build a Telescope
Telescope Equations
Telescope Equations: Minimum Magnification
Thiery Legault - How to adjust the focal length ?
Telescope Equations: Minimum Magnification
Newtonian Reflecting Telescope Designer
Telescopes and Microscopes
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Thiery Legault - How to adjust the focal length ?
Formula to estimate exposure from aperture & F ratio - Beginning Deep Sky Imaging - Cloudy Nights
Telescope Equations: Magnification
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Two-mirror telescopes: Cassegrain, Gregorian and variants
Telescope Focal Length Explained: Why Does It Matter? | StarLust
Telescope Equations: Magnification
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Telescope Magnification Calculator
