f-number (P6790)
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 |
|---|---|---|---|
| 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.
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Data type
Quantity
Statements
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Constraints
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please double check value. It may not be accurate. (English)
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