The name Cyclon applies to rangefinder conversions for the Gelto and other cameras. The list includes the Arsen, Roico, Molby, Picny, Vero Four and Boltax. These conversions were made by Sugaya Kōki Seisakusho and sold by Sankō-sha and by Matsuzaki Shashinki-ten in 1943 and 1944. They are described in more detail in the corresponding section of the Gelto page.
The April 1943 government inquiry also has a Cyclon (サイクロン) 3×4cm camera. It is registered as made by Miyamoto and distributed by Sankō-sha, surely the owner of the "Cyclon" brand. The lens is a three-element Cyclon 50/3.5, also made by Miyamoto. The shutter is perhaps of the focal-plane type. No detail is known about that camera.
- ↑ "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), item 162.
- ↑ "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), lens item Jb5.
- ↑ "Kokusan shashinki no genjōchōsa" ("Inquiry into Japanese cameras"), item 162: the shutter code is F-6, but this entry is missing from the shutter list. All the other shutters in the "F" category are of the focal-plane type.
- "Kokusan shashinki no genjōchōsa" (国産写真機ノ現状調査, Inquiry into Japanese cameras), listing Japanese camera production as of April 1943. Reproduced in Supuringu kamera de ikou: Zen 69 kishu no shōkai to tsukaikata (スプリングカメラでいこう: 全69機種の紹介と使い方, Let's try spring cameras: Presentation and use of 69 machines). Tokyo: Shashinkogyo Syuppan-sha, 2004. ISBN 4-87956-072-3. Pp.180–7. Item 162.