f-num·ber
noun/ˈef nʌmbə(r)/
/ˈef nʌmbər/
- a number that shows the relationship between the focal length of a camera lens and its diameter
f值：表示相机镜头焦距与其直径之间关系的数字 Word Originearly 20th cent.: from f (denoting the focal length) and number.
| 单词 | f-number |
| 释义 | f-num·bernoun/ˈef nʌmbə(r)/ /ˈef nʌmbər/
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