Yashima Kōgaku was a short-lived optical company set up as a division of a Yashima company that was an OEM for audio components. It was run by Ushiyama Jisaburō (牛山次三郎), a brother of Ushiyama Yoshimasa (牛山善政), the founder of the much earlier Yashima that had renamed itself after its Yashica products in 1958.
Yashima went bankrupt in the early 1980s.
- Lewis, p.149.
Sources and further reading
- The Japanese Historical Camera. 日本の歴史的カメラ (Nihon no rekishiteki kamera). 2nd ed. Tokyo: JCII Camera Museum, 2004. P.172. The Osanon Digital 750 is listed, and described as having "a digital display in its finder for indicating exposure time by reverse counting".
- Lewis, Gordon, ed. The History of the Japanese Camera. Rochester, N.Y.: George Eastman House, International Museum of Photography & Film, 1991. ISBN 0-935398-17-1 (paper), 0-935398-16-3 (hard). P.149.
- Miyazaki Yōji (宮崎洋司). "Yomigaeru ka, M42 maunto renzu no sekai o yuku: Kokusan kamera mēkā to M42 renzu" (よみがえるか、M42マウントレンズの世界をゆく：国産カメラメーカーとM42レンズ). Shashin Kōgyō (写真工業), April 2003. Pp.50–51, 55.