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词汇 f-number
释义 f-num·ber AHD[ĕfʹnŭm'bər] D.J.[ˈefˌnʌmbə]K.K.[ˈɛfˌnʌmbɚ]n.(名词)
  1. The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop F值:物镜或物镜系统的焦距与入射光孔直径之比 也作 f-stop
Etymology语源
    1. f(ocal length) f(ocal length)
    1. number number
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