f-number Definition
f·-number (ef′num′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.
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