| 单词 | f-number |
| 释义 | f-numbern. 数, 光圈数 f-number f-num.ber AHD: [µf“n¾m”b…r] D.J. [6ef7nJmb*]K.K. [6Wf7nJmb+]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语源:1. f(ocal length) f(ocal length)2. number number |
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