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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. 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.
- Asahi Camera (アサヒカメラ) editorial staff. Shōwa 10–40nen kōkoku ni miru kokusan kamera no rekishi (昭和10–40年広告にみる国産カメラの歴史, Japanese camera history as seen in advertisements, 1935–1965). Tokyo: Asahi Shinbunsha, 1994. ISBN 4-02-330312-7.
- "Kokusan shashinki no genjōchōsa" (国産写真機ノ現状調査, Inquiry into Japanese cameras), listing Japanese camera production as of April 1943. Reproduced in Supuringu kamera de ikou: Zen 69 kishu no shōkai to tsukaikata (スプリングカメラでいこう: 全69機種の紹介と使い方, Let's try spring cameras: Presentation and use of 69 machines). Tokyo: Shashinkogyo Syuppan-sha, 2004. ISBN 4-87956-072-3. Pp.180–7.