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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 has Wikipedia articles in 22 language editions, a strong signal of global cultural recognition.[1]

Key Facts

  • f-number is a type of dimensionless quantity[2].
  • f-number is a type of ratio of lengths[3].
  • f-number's Commons category is recorded as F-number[4].
  • f-number's facet of is recorded as exposure[5].
  • f-number's main Wikidata property is recorded as P6790[6].
  • f-number's unit symbol is recorded as {'lang': 'ca', 'text': "''f''"}[7].
  • f-number's maintained by WikiProject is recorded as WikiProject Mathematics[8].

Body

Definition and Type

Recorded subclass of include dimensionless quantity[2] and ratio of lengths[3].

Influence

Things named for f-number include F-Spot[9], an image viewer[10].

Why It Matters

f-number has Wikipedia articles in 22 language editions, a strong signal of global cultural recognition.[1] f-number is known by 46 alternative names across languages and contexts.[11]

Entities named for f-number include F-Spot[9], an image viewer[10].

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.

Inverse relationships (entities pointing at this one)

  1. [9] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [10] ↑ . Wikidata. wikidata.org. → on this site

Aggregate / graph-position facts

  1. [1] ↑ . Wikidata sitelinks. wikidata.org.
  2. [11] ↑ . 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)

Canonical URL: https://4ort.xyz/entity/f-number · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 7d ago · Nyuhn · 2026-07-10 view diff on Wikidata ↗
    P14541 → 3qYJhP
    Main wikidata property → P6790
    Aliases → —
    Facet of → exposure
    + 3 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/40849|batch #40849]]: ZGBK ID"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.