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Definition of F Number in English :

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F Number

see synonyms of f number

Noun

1. f number, focal ratio, speed, stop number

the ratio of the focal length to the diameter of a (camera) lens system

WordNet Lexical Database for English. Princeton University. 2010.

F Number

see synonyms of f number
noun
photography
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

Collins English Dictionary. Copyright © HarperCollins Publishers

F Number

see synonyms of f number
noun
Photography
a number that represents the relative aperture of a lens, equal to the focal length divided by the effective diameter of the lens aperture: a higher number indicates a smaller opening

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

F Number

see synonyms of f number
n.
The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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