f-number 的定义
Optics, Photography.
- a number corresponding to the ratio of the focal length to the diameter of a lens system, especially a camera lens. In f/1.4, 1.4 is the f-number and signifies that the focal length of the lens is 1.4 times as great as the diameter. Abbreviations:f/, f/, f, f:
更多f-number例句
- The program has not made a final selection on which upgrades will actually be included in future versions of the F-35.
- That article noted that the F-35 does not currently have the ability to down-link live video to ground troops,.
- In fact, according to F-35 program sources, the next software upgrades are not yet fully defined nor are they fully funded.
- Therefore, it is not possible for any F-35 schedule to include a video data link or infrared pointer at this point.
- “Our members continue to face a number of challenges,” she said.
- The country is well inhabited, for it contains fifty-one cities, near a hundred walled towns, and a great number of villages.
- We had six field-pieces, but we only took four, harnessed wit twice the usual number of horses.
- There are a number of bacilli, called acid-fast bacilli, which stain in the same way as the tubercle bacillus.
- Five of the number had studied with Liszt before, and the young men are artists already before the public.
- E was an Esquire, with pride on his brow; F was a Farmer, and followed the plough.