F-number



[ef-nuhm-ber] /ˈɛfˌnʌm bər/

noun, Optics, Photography.
1.
a number corresponding to the ratio of the focal length to the diameter of a lens system, especially a camera lens. In f /1.4, 1.4 is the f-number and signifies that the focal length of the lens is 1.4 times as great as the diameter. /, f/, f, f:
Abbreviation: f.
noun
1.
(photog) the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture See also T-number

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