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Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
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Please explain focal ratio vs. exposure time - Beginning Deep Sky Imaging - Cloudy Nights
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How Focal Ratio Affects Your Astro Images - Sky & Telescope - Sky & Telescope
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Telescope stats explained | BBC Sky at Night Magazine
Solved Table 1: Equations for Telescope Definition Equation | Chegg.com
Telescopes: Focal ratio, plane and telescope types - YouTube
