TERMIUM Plus®

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NOMBRE OUVERTURE [1 record]

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Record 1 2004-06-10

English

Subject field(s)
  • Photography
CONT

The relative aperture given by a particular lens stop is called the f/number, and its value is expressed by the letter "f" followed by a figure - e.g., f/4.5, which indicates that the focal length of the lens is 4.5 times larger than the effective diameter of the stop.

OBS

f/number: term standardized by the Canadian General Standards Board (CGSB).

French

Domaine(s)
  • Photographie
DEF

[...] ouverture relative d'un objectif particulier.

OBS

Ainsi [pour f:5.6] la distance focale de l'objectif est 5.6 fois plus grande que le diamètre du diaphragme.

Spanish

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