f-number (P6790)

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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.
  • focal ratio
  • ƒ-number
  • f-ratio

Data type

Quantity

Statements

Wikidata property example for media
Kew fountain (long exposure).jpg
5,616 × 3,744; 14.47 MB
f-number
10
0 references
Kew fountain (short exposure).jpg
5,616 × 3,744; 15.99 MB
f-number
5.6
0 references
related property
ISO speed
0 references
exposure time
0 references
aperture
0 references

Constraints

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