What does f-number mean?

Definitions for f-numberˈɛfˌnʌm bər

Here are all the possible meanings and translations of the word f-number.


  1. f-number(Noun)

    The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.


  1. F-number

    In optics, the f-number of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography.


  1. Chaldean Numerology

    The numerical value of f-number in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of f-number in Pythagorean Numerology is: 7

Sample Sentences & Example Usage

  1. Doug Larson:

    There are worse things than getting a call for the wrong number at 4 AM. It could be the right number.

  2. Anthony Scaramucci:

    There's a number that's enough and there's a number that's not enough, the $20 million number is enough.

  3. Gary Holder-Winfield:

    Politics is about the control of a limited number of resources by a limited number of people who think that number is too many

  4. Dieter Schwarz in 2004:

    Number one: we want Lidl to get stronger in existing markets. Number two: we will expand to new countries. Number three: we will fundamentally overhaul Kaufland.

  5. Tom Hopkins:

    I am not judged by the number of times I fail, but by the number of times I succeed and the number of times I succeed is in direct proportion to the number of times I can fail and keep on trying.

Images & Illustrations of f-number


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"f-number." Definitions.net. STANDS4 LLC, 2017. Web. 24 May 2017. <http://www.definitions.net/definition/f-number>.

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