Definition of F-number

1. Noun. (photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens. ¹

¹ Source: wiktionary.com

Medical Definition of F-number

1. In optics, denotes the ratio of the equivalent focal length of an objective lens to the diameter of its entrance pupil. (09 Oct 1997)

Lexicographical Neighbors of F-number

f**ked
f**king
f**ks
f-1 generation
f-2 generation
f-bombs
f-hole
f-holes
f-number (current term)
f-stop
f-worded
f-wording
f-words
f.
f/k/a
f/stop
f2 fragment
fMLP
fMRI
fMet
fMet-tRNA
f distribution

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