Translation of "f-number" into French

f : chiffre, ouverture are the top translations of "f-number" into French.

f-number noun feminine grammar

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

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English-French dictionary

  • f : chiffre

    In photography, the diameter of the aperture expressed in terms of the focal length of the camera lens. The greater the f-number, the less light reaches the film and the more in focus the objects in the foreground and the background will be. For example, with an f-number = 16 the objects in the far background will be in focus. Whereas, with an f-number = 2 the background will be blurry (while foreground objects are in focus).

    Importantly, the viewing lens assembly is of the same working f-number as the projection lens assembly.

    Point important: l'objectif de visualisation présente la même f: chiffre effectif que l'objectif de projection.

  • ouverture

    noun

    rapport entre la distance focale de cet objectif et le diamètre de sa pupille d'entrée

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