The Adam (アダム) is a cardboard box camera sold by Sone Shunsuidō from 1918. It has no viewfinder and no shutter (the exposure time is controlled by the lens cap). It does not take plate holders, and No.0 plates (4×5cm) must be inserted into the camera one by one in a darkroom. The Adam was the first Japanese camera to sell for ¥1.
- 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). Pp.26–7.
- Sugiyama, Kōichi (杉山浩一); Naoi, Hiroaki (直井浩明); Bullock, John R. The Collector's Guide to Japanese Cameras. 国産カメラ図鑑 (Kokusan kamera zukan). Tokyo: Asahi Sonorama, 1985. ISBN 4-257-03187-5. Items 4006–7.
- Yazawa Seiichirō (矢沢征一郎). "Renzu no hanashi (174) Tesutā" (レンズの話テスター, Lens story  Testar). In Camera Collectors' News no.264 (June 1999). Nishinomiya: Camera Collectors News-sha. Pp.11–6.