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F-NUMBER Definition & Meaning | Dictionary.com

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f-number

or f number

[ ef-nuhm-ber ]

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, f:


f-number

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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of f-number1

First recorded in 1890–95
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Example Sentences

Instead of F-number keys, there are buttons for switching tabs, switching to full screen mode and moving backward and forward in the browser.

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