Carl Zeiss Contarex Biogon 21mm f/4.5
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| Company | Carl Zeiss AG |
| Country | West Germany |
| Year of manufacture | 1964 |
| Type | Ultra-Wide angle |
| Focal length | 21mm |
| Aperture | f/4.5 |
| Flange range at infinity | 46 mm |
| Optics |  |
| Image circle at infinity |  |
