Kadunder Shōkai (カゼンデル商会) was a Japanese distributor in the 1930s and early 1940s, based in Tokyo. It is said that it also operated under the English name Kadunder Photo Supply Co., and that it was the sole Asian agent for the Corygon lenses by Friedrich. It distributed the Auto Keef 4×4 rangefinder camera and the Semi Keef 4.5×6 camera in the early 1940s (see the corresponding pages).
- It is said that it was based in Kanda in Yazawa, p.15 of Camera Collectors' News no.235. Its address in 1943 was a postal box: 私書函東京中央郵便局656, meaning Tokyo Central Post Office, Postal Box 656. Source: advertisement dated March 1943 reproduced in Kokusan kamera no rekishi, p.65.
- Yazawa, p.15 of Camera Collectors' News no.235.
- 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.
- "Kamera no kōtei kakaku kanpō happyō" (カメラの公定価格官報発表, Official announcement of the set prices of the cameras), November 1941. Extract of a table listing Japanese camera production and setting the retail prices, reproduced in "Bebī Semi Fāsuto 'Kore ha bebī wo nanotta semi-ki da'" (ベビーセミファースト"これはベビーを名乗ったセミ機だ", Baby Semi First, 'this is a Semi camera called Baby'), an article by Furukawa Yasuo (古川保男) in Camera Collectors' News no. 277 (July 2000). Nishinomiya: Camera Collectors News-sha. P. 27.
- Yazawa Seiichirō (矢沢征一郎). "Renzu no hanashi (145) Rōzen to Korigon" (レンズの話ローゼンとコリゴン, Lens story  Rosen and Corygon). In Camera Collectors' News no.235 (January 1997). Nishinomiya: Camera Collectors News-sha. Pp.15–9.