Mamiya 7 65mm Lens: Damaged Shutter Blades on a Loose Pivot
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This Mamiya 7 65mm lens came into the shop with an erratic shutter. Sometimes it would not open or open partially. Looking at the second photo shows one of the shutter blades hanging down into the aperture. This tells me that the issue is with a damaged shutter blade.
After removing the shutter from the lens and doing some disassembly, I noticed that the shutter blade at around ten 0’clock (seen in photo four) was damaged where it rides on the pivot. Turns out that the pivot had come loose and was causing the blade to flop around. Actually, there are two blades on this pivot and they both had damage as shown in photo six. It is not common for shutter blade pivots to screw into the mechanism but in this case, it was screwed in and had come loose. These 00 Mamiya shutters are usually quite robust and generally work with no issues.
After replacing both blades, shutter is alive and well.
