Meaning of f-number
F-number
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Digital photography
Glossary of photography terms
Meaning and definition of f-number :
The number resulting when the focal length of a lens is divided by the diameter of the aperture. A sequence of f-numbers calibrates the aperture in regular steps (known as stops) between the minimum and maximum openings of the lens. The f-numbers generally follow a standard sequence, in such a way that the interval between one full stop and the next represents a halving or doubling in the image brightness. The f-numbers become progressively higher as the aperture is reduced to allow in less light, i.e. f/5.6, f/8, f/11, f/16, f/22... Theoretically, all lenses at the same f-number produce images of equal brightness. Also called f-stop or relative aperture.
For the term f-number may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes.
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Glossary of photography terms
F-number
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