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Seitō Kōgaku Kenkyūsho (誠東光学研究所) was a Japanese camera maker at the beginning of the 1940s. Its address in 1940 was Takinogawa-ku Kaminakazato (瀧野川区上中里) 510 in Tokyo.[1] It made the Seito Ref 6×6 SLR announced in 1940, and its Seito 75/3.5 lens. The company also distributed the Farben Duto filters.[1]


  1. 1.0 1.1 Advertisement dated December 1940 reproduced in Kokusan kamera no rekishi, p. 77.