f-number

名词 f-number:

1. the ratio of the focal length to the diameter of a (camera) lens system
   同义词：focal ratio, f number, stop number, speed

f-num.ber

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

来源：
f(ocal length)
f(ocal length)
number
number