# Petzval lens

> first photographic portrait objective lens in the history of photography

**Wikidata**: [Q251700](https://www.wikidata.org/wiki/Q251700)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Petzval_lens)  
**Source**: https://4ort.xyz/entity/petzval-lens


## References

1. Freebase Data Dumps. 2013