奇客生活牛津词典

f number

F 开头单词

柯林斯词典

    f-number (also f number)

  • 1. N 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 焦距比数[photog] →see alsoT-number

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