What Japanese brand-name lens was used between 1940 and 1980 by the German camera company founded by Ernst Leitz?
Rokkor Rokkor was a brand name used for all Chiyoda Kōgaku Seikō and later Minolta lenses between 1940 and 1980, including a few, which were marketed and sold by other companies like Leica. The name was derived from the name of Rokkō (六甲山), a 932 m high mountain, which could be seen from the company's glass-making and optics factory at Mukogawa near Osaka, Japan. The company's founder wanted the name to symbolize the high quality in optics.
Doi (retailer) Doi (株式会社ドイ , Kabushiki Kaisha Doi ) was a large Japanese retailer and distributor, best known outside Japan as the company that revived the Plaubel Makina 67 camera in the late 1970s and early 1980s.