Two Japanese companies called Tsukada are known; it is unclear if they was related to each other.
Tsukada Shōkai (塚田商会) was a repair shop active in Tokyo in early 1949, which advertised itself as producing coupled tele lenses in Leica mount and tele lenses in Korelle and Exakta mount. No Tsukada lens is known to have surfaced so far.
|Advertisement by Tsukada Shōkai in Ars Camera February 1949,|
mentioning the production of tele lenses. (Image rights)
Tsukada Shōji K.K. (塚田商事㈱) was a distributor based in Tokyo in the first half of the 1950s. It advertised the Tacker subminiature camera in early 1950 and the Tomic and Planet 6×6 folders in late 1952.
|Advertisement by Tsukada Shōji in Asahi Camera April 1950,|
mentioning the Tacker subminiature and offering repair service. (Image rights)
- Advertisement in Ars Camera February 1949, p.48. The address was in Jinbōchō (神保町), next to the Nikkatsu-kan (日活館) movie theater.
- The address was Tōkyō-to Taitō-ku Asakusa Kotobuki-chō 124 (東京都台東区浅草寿町124). Source: advertisements dated February 1950 to November 1952, reproduced in Kokusan kamera no rekishi, pp.145 and 174.
- Ars Camera. Advertisement by Tsukada Shōkai in February 1949 (p.48).
- Asahi Camera. Advertisement by Tsukada Shōji in April 1950, p.114.
- 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.