Carl Zeiss Jena Flektogon 20mm f/4
| Company | Carl Zeiss Jena |
| Country | East Germany |
| Year of manufacture | 1973 |
| Type | Wide-angle |
| Focal length | 20mm |
| Aperture | f/4 |
| Flange range at infinity | 45.46mm |
| Company | Carl Zeiss Jena |
| Country | East Germany |
| Year of manufacture | 1973 |
| Type | Wide-angle |
| Focal length | 20mm |
| Aperture | f/4 |
| Flange range at infinity | 45.46mm |
