f-number Hear it!

f-number Definition

f·-number (efnum′bər)

noun

Photog. 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

f-number Usage Examples

Adjective modifier

  • rgb-optimised: D65 performance and dynamic range is adjusted by an illumination system with RGB-optimised f-numbers.
  • large: For instance, if you are calculating the scene illumination for a larger f-number you will expect a higher value.
  • high: You will find the details about the lights with high F-numbers in chapter 3.10, and in the appendix.

Browse dictionary entries near f-number

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