Focal Ratio Calculator Calculate the focal ratio of your telescope. Formula: Focal Length / Aperture Focal Length: mm mm f/
A 200-mm (8-inch) telescope with a 2,000-mm focal length has a focal ratio of f/10. By contrast a 200-mm astrograph (a telescope designed for astrophotography) that has a
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The ratio calculator performs three types of operations and shows the steps to solve: Simplify ratios or create an equivalent ratio when one side of the ratio is empty. Solve ratios for the one
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