Focal length

https://www.wikidata.org/wiki/Q193540

Field Hierarchy

Parent
Biology 36.7M papers	Physics 33.6M papers	Engineering 25.6M papers	Geology 10.6M papers
Optics 8.2M papers	Paleontology 5.6M papers	Petroleum engineering 510k papers	Lens (geology) 168k papers
Lens (optics) 18 papers
Current
Focal length 13.8k papers
Child
Zoom lens 1,579 papers	Angular aperture 1,034 papers	Simple lens 930 papers

Trends

Notes

History