F-Stop

In digital photography and digital video recording, F-stop refers to the international standard sequence of numbers that express relative aperture. F-stop is the “lens focal length” divided by the “effective aperture diameter.” The smaller the F- number, the greater the amount of light that passes through the lens. Each change of F-stop halves or doubles the image brightness as you step up or down.

Vangie Beal
Vangie Beal is a freelance business and technology writer covering Internet technologies and online business since the late '90s.

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