Telescope Focal Ratio Explained - YouTube
Telescopes: Focal ratio, plane and telescope types - YouTube
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Focal Ratio of a Telescope, Explained - The Alien Tech
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Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
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Astro Tutorial #1.6: THE F-RATIO "fast" vs "slow" scopes - YouTube
Archivos del blog
Optical system of a telescope
Confused with scope focal length - what am I missing? - Beginners Forum (No Astrophotography) - Cloudy Nights
The Ultimate Guide to Celestron Optical Tubes | Celestron
Please explain focal ratio vs. exposure time - Beginning Deep Sky Imaging - Cloudy Nights
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