ratio of the system's focal length to the diameter of the entrance pupil. Sample: 4 (generally written "ƒ/4") for a lens with 200 mm focal length using an entrance pupil diameter of 50 mm.
- focal ratio
- ƒ-number
- f-ratio
| Language | Label | Description | Also known as |
|---|---|---|---|
| default for all languages | No label defined |
–
|
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| English | f-number |
ratio of the system's focal length to the diameter of the entrance pupil. Sample: 4 (generally written "ƒ/4") for a lens with 200 mm focal length using an entrance pupil diameter of 50 mm. |
|
Data type
Quantity
Statements
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2.5
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.jpg){kind=link}
Kew fountain (long exposure).jpg
5,616 × 3,744; 14.47 MB
5,616 × 3,744; 14.47 MB
10
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.jpg){kind=link}
Kew fountain (short exposure).jpg
5,616 × 3,744; 15.99 MB
5,616 × 3,744; 15.99 MB
5.6
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Constraints
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please double check value. It may not be accurate. (English)
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