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Focal Length | Imaging the Universe - The University of Iowa
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Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Telescope Focal Length: Everything You Need To Know
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How to Choose A Telescope for Astronomy | Types of Telescopes - Sky & Telescope
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Telescopes - A UBC Math 309 Project - Refractive Telescopes
Telescope stats explained | BBC Sky at Night Magazine
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Confused with scope focal length - what am I missing? - Beginners Forum (No Astrophotography) - Cloudy Nights
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Aperture, focal length and focal ratio - Optics Trade Blog
Two-mirror telescopes: Cassegrain, Gregorian and variants
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Telescope Equations: Magnification
focal length - Society for Popular Astronomy
The Optics of Telescopes | Let's Talk Science
Refracting Telescopes
