The Semi Keef (セミキーフ) is a Japanese 4.5×6 camera, about which little is known. It is mentioned in the official list of set prices compiled in October 1940 and published in January 1941, in the following versions: "Semi Keef III" (¥62), "Semi Keef IV" (¥74), "Semi Keef V" (¥85) and "Semi Keef VI" (¥98). The Semi Keef III also appears in a similar price list dated November 1941, where it is attributed to Kadunder Shōkai, the distributor of the Auto Keef made by Kokusaku. The Semi Keef was perhaps made by Kokusaku as well.
- "Kokusan shashinki no kōtei kakaku", type 3, sections 3A, 4A, 5A, 7A.
- "Kamera no kōtei kakaku kanpō happyō", November 1941, type 3, section 3A.
- "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. Type 3, section 7B.
- "Kokusan shashinki no kōtei kakaku" (国産写真機の公定価格, Set prices of the Japanese cameras), listing Japanese camera production as of October 25, 1940 and setting the retail prices from December 10, 1940. Published in Asahi Camera January 1941 and reproduced in 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. Pp.108—9. Type 3, sections 3A, 4A, 5A, 7A.