Mamiya 6 50mm Lens: Bent Cocking Shaft and Shutter Replacement
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This Mamiya 6 50mm lens would not release the shutter blades. After disassembly, I found that the cocking shaft in the shutter was binding, slightly bent. In this case, I just replaced the complete shutter assembly as parts are not available for the shutter (Mamiya 00 shutter).
Photos: 3 is of the shutter removed from the lens and you can see the two electromagnets, one for opening the shutter and the other for timing the closing of the blades. 4 is the front of the cocking angle calibration tool. 5 shows the rear of the cocking angle calibration tool and how it extends into the lens and makes contact with the sliding cocking lever on the lens. 6 video of the cocking angle tool- when moving the tool counterclockwise and stopping at the red index mark (31 degrees) the shutter should be cocked and ready to release. In this case, it works fine after installation of the new shutter and adjusting the cocking lever.
