information about Focal length field
Field Hierarchy
| Parent | |||
|---|---|---|---|
Biology 36M papers | Physics 33M papers | Engineering 25M papers | Geology 10.4M papers |
Optics 8.1M papers | Paleontology 5.5M papers | Petroleum engineering 498k papers | Lens (geology) 165k papers |
Lens (optics) 18 papers | |||
| Current | |||
Focal length 13.7k papers | |||
| Child | |||
Zoom lens 1,555 papers | Angular aperture 1,028 papers | Simple lens 924 papers | |
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