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Basics Part 1: Understanding Aperture, Focal Length and Focal Ratios – Blackwater Skies
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Statistics 101: F-ratio Test for Two Equal Variances In this video we learn how to use the F-ratio and F-distribution to … | Degrees of freedom, Equality, Numerator
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
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What determines a telescope's fstop? I often see the same size lens with different fstops. - Quora
