f-number

f-num·ber

(ĕf′nŭm′bər)n. The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop.

[f(ocal length) + number.]

f-number

f number

n (Photography) photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture. See also T-number

f-number

(ˈɛfˌnʌm bər)

n. a number corresponding to the ratio of the focal length to the diameter of a lens system, esp. a camera lens. Symbol: f/ [1890–95]

Translations

单词	f-number
释义	f-number f-num·ber (ĕf′nŭm′bər)n. The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop. [f(ocal length) + number.] f-number or f number n (Photography) photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture. See also T-number f-number (ˈɛfˌnʌm bər) n. a number corresponding to the ratio of the focal length to the diameter of a lens system, esp. a camera lens. Symbol: f/ [1890–95] Translations f-number f-number , f number Photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture MedicalSeef number
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