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

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Q27151329 (Deleted Item)
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Q862169 (Deleted Item)
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Q34788400 (Deleted Item)
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Q19819228 (Deleted Item)
2.5
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Q21514353 (Deleted Item)
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Q21503250 (Deleted Item)
Q21503252 (Deleted Item)
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Q21510860 (Deleted Item)
Q21502408 (Deleted Item)
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Q21510860 (Deleted Item)
Q62026391 (Deleted Item)
please double check value. It may not be accurate. (English)
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