f-number

ratio of the focal length to the diameter of the entrance pupil
Thing general Q862169
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f-number

Summary

f-number ranks in the top 1% of general entities by monthly Wikipedia readership (1,079 views/month).[1]

Key Facts

  • f-number's image is recorded as APERTURE.png[2].
  • f-number's subclass of is recorded as dimensionless quantity[3].
  • f-number's subclass of is recorded as ratio of lengths[4].
  • f-number's Commons category is recorded as F-number[5].
  • f-number's Freebase ID is recorded as /m/016hsk[6].
  • f-number's facet of is recorded as exposure[7].
  • f-number's main Wikidata property is recorded as P6790[8].
  • f-number's defining formula is recorded as N = \frac {f}{D}[9].
  • f-number's Great Russian Encyclopedia Online ID is recorded as 2698063[10].
  • f-number's ISQ dimension is recorded as 1[11].
  • f-number's unit symbol is recorded as {'lang': 'ca', 'text': "''f''"}[12].
  • f-number's maintained by WikiProject is recorded as WikiProject Mathematics[13].
  • f-number's Microsoft Academic ID is recorded as 154614335[14].
  • f-number's in defining formula is recorded as N[15].
  • f-number's in defining formula is recorded as f[16].
  • f-number's in defining formula is recorded as D[17].
  • f-number's quantity symbol is recorded as N[18].
  • f-number's quantity symbol is recorded as k[19].
  • f-number's WordNet 3.1 Synset ID is recorded as 13843620-n[20].
  • f-number's MetaSat ID is recorded as focalRatio[21].
  • f-number's Encyclopedia of China is recorded as 531790[22].

Body

Works and Contributions

Things named for f-number include F-Spot[23], an image viewer[24].

Why It Matters

f-number ranks in the top 1% of general entities by monthly Wikipedia readership (1,079 views/month).[1] f-number has Wikipedia articles in 22 language editions, a strong signal of global cultural recognition.[25] f-number is known by 46 alternative names across languages and contexts.[26]

Entities named for f-number include F-Spot[23], an image viewer[24].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] . wikidata.org.
  2. [3] . wikidata.org.
  3. [4] . wikidata.org.
  4. [5] . wikidata.org.
  5. [6] . wikidata.org.
  6. [7] . wikidata.org.
  7. [8] . wikidata.org.
  8. [9] . wikidata.org.
  9. [10] . wikidata.org.
  10. [11] . wikidata.org.
  11. [12] . wikidata.org.
  12. [13] . wikidata.org.
  13. [14] . wikidata.org.
  14. [15] . wikidata.org.
  15. [16] . wikidata.org.
  16. [17] . wikidata.org.
  17. [18] . wikidata.org.
  18. [19] . wikidata.org.
  19. [20] . wikidata.org.
  20. [21] . wikidata.org.
  21. [22] . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [23] . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [24] . Wikidata. wikidata.org. → on this site

Aggregate / graph-position facts

  1. [1] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [25] . Wikidata sitelinks. wikidata.org.
  3. [26] . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). f-number. Retrieved April 10, 2026, from https://4ort.xyz/entity/f-number
MLA “f-number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/f-number.
BibTeX @misc{4ortxyz_f-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{f-number}}, year = {2026}, url = {https://4ort.xyz/entity/f-number}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): f-number — https://4ort.xyz/entity/f-number (retrieved 2026-04-10)

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