| 释义 |
f-num·ber AHD[ĕfʹnŭm'bər] D.J.[ˈefˌnʌmbə]K.K.[ˈɛfˌnʌmbɚ]n.（名词）- 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
- f(ocal length) f(ocal length)
- number number
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