Mamiya DSX 1000

Like the Mamiya MSX, it also came in 500 or 1000 models, and both use the SX series of Mamiya 42mm threaded lenses, which have a lens mount lock (unlike previous Mamiya threaded lenses) and a mechanical pin which transmits the f-stop information to the camera, eliminating the need to stop-down for metering.

Links

• Resource for every Mamiya 35mm collector