Union Kōgaku K.K. (ユニオン光学株式会社) was a Japanese company that sold the Union Semi in 1953–4 (a rebadged Zenobia) and perhaps the Union Model U at an unknown date. According to a 1953 advertisement, Union Kōgaku was a microscope maker and the Union Semi was its first camera.
A company with the same name still (2007) exists and makes microscopes and other optical devices. It was founded in 1991, but it is a subsidiary of a company called Union Holdings K.K. (ユニオンホールディングス株式会社) founded in 1948.
- Union Semi or Union C-II (4.5×6 folder)
- Union Model U (4.5×6 folder)
The Easternflex TLR was announced with Unicor 75/3.5 four-element lenses made by Union Kōgaku.
- ↑ Advertisement dated May 1953 reproduced in Kokusan kamera no rekishi, p. 202.
- ↑ Company history of Union Kōgaku and Company profile of Union Holdings.
- ↑ Name inferred from the katakana ユニコール.
- ↑ Kokusan kamera no rekishi, p. 346 (item 381).
- 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. Item 975.
- Profile page of the official website of Union Kōgaku (in Japanese)