Tōkyō Kōken K.K. (東京光研㈱, meaning Tokyo Optical Research) was a Japanese company which made the Dolca 35 cameras from late 1952 to early 1956. Its address was Arakawa-ku Nippori (荒川区日暮里) 8–577 in Tokyo. Four known Models of 35mm cameras were made:
Dolca 35-l 1953 = Tokyo Koken Komeil 50mm F:3.5 in Nipol shutter B,1-200 Single viewfinder ; winding button on front
Dolca 35-ll 1953 = Nipool lens 50mm F:3.5 coupled Tinted glass rangefinder; Nipol shutter B,1-200 winding button on back.weight 694g
Dolca 35-llA = 1954 Nipool 50mm F:2.8 coupled rangefinder, Nipol B,1-200
Dolca 35-U 1955 Nipool 40mm F:3.5 Nipol shutter B, 1-300 Round front windows on coupled rangefinder.
- ↑ Advertisements dated September 1954 to February 1956 reproduced in Kokusan kamera no rekishi, pp. 154 and 260.
- 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. Sugiyama Collectors guide to Japanese Cameras Book printed in 1984 on pg.159