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The Rectus is a leaf shutter found on some Japanese cameras from the 1950s. There are at least two variants, with B, 1–200 and B, 1–300 speeds. It was made by Fuji Seimitsu, which also made the Ceres leaf shutter.[1] It seems that it was a copy of the Prontor II.[2]

Cameras equipped with a Rectus shutter

The following list is incomplete. That a particular model is listed should not be taken to mean that all examples were fitted with the Rectus.


  1. Attribution of the Rectus to Fuji Seimitsu: a leaflet advertising the Mine Six IIF; also this page (archived) at Japan Family Camera.
  2. See this post (archived) in the Classic Camera Repair Forum. Takane claims that it is "Prontor type" (プロンタータイプ) in a leaflet advertising the Mine Six IIF.
  3. Image in Camera-Wiki Pool