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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
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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.
    • 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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