TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

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Record 1 2004-05-26

English

Subject field(s)
  • Optics
  • Photography
DEF

A measure of how much light can pass through a lens when its diaphragm is opened fully.

CONT

Lenses with maximum apertures of f-2 or f-2.8 are categorized as "fast" and can produce correct exposures under lower light than "slow" lenses with maximum apertures of f-3.5 or smaller.

French

Domaine(s)
  • Optique
  • Photographie
DEF

Paramètre permettant de déterminer la luminosité d'un objectif [et correspondant à sa plus grande ouverture].

OBS

Le nombre d'ouvertures est donné par f/D, f étant la focale de l'objectif et D son diamètre. Plus ce nombre est petit, plus l'objectif est lumineux. Un objectif très lumineux permet d'utiliser des vitesses d'obturation élevées pour éviter le flou de bougé.

Spanish

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© Public Services and Procurement Canada, 2024
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau

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