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See also the Convex Reflex SLR camera.

The name Convex or Convex-Rapid is found on some Japanese leaf shutters of the 1940s and 1950s. All these shutters are linked to the company Motodori, later Tōkyō Seiki, which was certainly the owner of the "Convex" brand. In 1951, the Convex-Rapid was announced as "made by Tōkyō Seiki".[1] Some Convex shutters mounted on the Doris-P have OKK markings and an OKK logo on the front plate, others have an OK logo on the aperture scale, and others have no logo at all.

Versions and cameras equipped

This list is perhaps incomplete, and not all the versions of the cameras were equipped with a Convex shutter.

  • Convex-Rapid (T, B, 1–300), advertised in 1942–3 on the Zeitax
  • Convex-Rapid (B, 1–500, synchronized), announced in 1951–2 on the Semi Rocket
  • Convex (B, 10–200, ASA or PC synch), observed on the Doris-P
  • Convex (B, 1–200, synchronized), observed on the Doris Six II and the Doris IA


  1. Column in Asahi Camera February 1951, p.104, and erratum in Asahi Camera March 1951, p.104.