# lens speed

> maximum aperture diameter, or minimum f-number, of a photographic lens

**Wikidata**: [Q220637](https://www.wikidata.org/wiki/Q220637)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lens_speed)  
**Source**: https://4ort.xyz/entity/lens-speed


## References

1. Freebase Data Dumps. 2013