f-number

漢語翻譯

n. 數, 光圈數

英文解釋：

名詞 f-number:

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

詳細解釋：

f-num.ber

n.（名詞）
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：物鏡或物鏡系統的焦距與入射光孔直徑之比也作 f-stop

來源：
f(ocal length)
f(ocal length)
number
number