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.

Similar
f-value
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Meanings

nounf-number (plural f-numbers)

plural f-numbers

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

    Synonyms: f-value

Synonyms & antonyms

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

Similar
f-value
Also see
f-value

Translations

Finnish aukkosuhde, aukko
  • aukkosuhderatio of the focal length of a lens to its diameter
  • aukkoratio of the focal length of a lens to its diameter
Hungarian fényerő
  • fényerőratio of the focal length of a lens to its diameter
Indonesian bukaan, nilai bukaan
  • bukaanratio of the focal length of a lens to its diameter
  • nilai bukaanratio of the focal length of a lens to its diameter
Māori waepuare
  • waepuareratio of the focal length of a lens to its diameter
Cite this entry
APA

f-number. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/f-number

MLA

“f-number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/f-number. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “f-number,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/f-number.

Source: f-number on Wiktionary, CC BY-SA 4.0.