![]() ![]() It is calculated by dividing the system's focal length by the diameter of the entrance pupil ("clear aperture"). ![]() ![]() For other uses, see F-number (disambiguation).ĭiagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments each aperture has half the light-gathering area of the previous one.Īn f-number is a measure of the light-gathering ability of an optical system such as a camera lens.
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