Focal length

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

Field Hierarchy

Parent
Biology 34.8M papers	Physics 31.7M papers	Engineering 23.9M papers	Geology 9.1M papers
Optics 7.9M papers	Paleontology 5.3M papers	Petroleum engineering 466k papers	Lens (geology) 161k papers
Current
Focal length 13.4k papers
Child
Zoom lens 1,570 papers	Angular aperture 1,007 papers	Simple lens 899 papers

Trends

Notes

History