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Zeika was a Japanese lens maker in the 1950s and perhaps 1960s. It was based in Tokyo and used the English name Zeika Optco (Zeica Optical Company Ltd.). The name "Zeika" was certainly a mix of Zeiss and Leica. The company made mainly cine lenses, but a few Zeika lenses are known for still cameras.
- Rojar 3.5cm f/3.5 for Leica, also sold by Sans & Streiffe as the Sans & Streiffe 3.5cm f/3.5
- Rojar 80mm f/3.5 for Exakta mount or 42mm screw mount
- Wide Angle 35mm f/4.2 for Argus C, two engraving variations