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What does f 4 mean in photography?

Asked: ?♾️, Last Updated:

F (the F ratio) is defined as = focal length (f) / aperture. Rearranging gives aperture = f(focal length / F (the F ratio). So if you have a 50mm focal length and a 12mm aperture, F = 4, and aperture = f/4 (traditionally, a lot of rounding is allowed with lens specifications).

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