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KOC is the brand on a shutter used in some Japanese folding cameras in the 1950s. One of these is the Carl Six, and it has been suggested that these shutters were made by the Kigawa Optical Company, the producer of the Carl Six.

Cameras on which KOC shutters have been seen:

  • Atom Six (more often seen with other shutters); 1/10 - 1/200 sec plus B, with delayed action, cable release socket and flash synch. contact (ASA bayonet type);
  • Carl Six; as above.
  • Kikuca 35; this is a different shutter to the above, being on a 35 mm camera, and reported to give speeds 1 - 1/200 sec and with a PC socket.