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Definition 2025

f-number

f-number

English

Noun

f-number ‎(plural f-numbers)

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

Translations

ratio of the focal length of a lens to its diameter

Finnish: aukkosuhde, aukko (fi)

Maori: waepuare

See also

f-stop