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If you change the aperture/F# by a factor of 2 (2x, 1/2) it changes the DOF by a factor of 2 as well. But if you change the FL or the subject/focus distance by a factor of 2 it changes the DOF by a factor of 4... they have 2x the effect that aperture does, only in opposite directions from each other. "So what (correct) statement can be made to compare ...


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What your friend told you is a way to estimate background blur, not depth of field. If you look at the DOF formula, you'll see it's inversely proportional to f2/N, not f/N. This corresponds with your statement, "focal length has an higher impact on DOF than the F-stop". DOF = 2 u2 N C / f2 N = aperture F-number C = circle of confusion u = ...


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