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Miyamoto Lens Kenkyūjo (宮本レンズ研究所) was a Japanese company based in Tokyo, Shinagawa in 1943.[1] It is listed in the April 1943 government inquiry as the maker of the Cyclon 3×4cm camera and its Cyclon 50/3.5 three-element lens.[2] The camera was distributed by Sankō-sha, the same company which sold rangefinder conversions for the Gelto and other cameras, under the same brand "Cyclon".


  1. Its address in 1943 was Tōkyō-to Shinagawa-ku Ōi Minami-Hamakawa-chō 1626 (東京都品川区大井南浜川町1626). Source: "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras").
  2. "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), item 162, lens item Jb5.