martynas_photo Posted June 2, 2022 Share Posted June 2, 2022 (edited) Hello, I have a 250mm lens for Mamiya TLR. It sat on a shelf for many years, since the shutter was not working and I never felt courageous enough to attempt a repair myself. However, this day has come, for good or bad and I have disassembled the lens. Carefully photographing each step, so that it would not end as most alarm clocks from my childhood... i.e. with parts on table after reassembly and still not functional for whatever reason:) The question/problem is as follows. the shutter can be wound and released. However, the blades do not open, neither the shutter times are correct, i.e. nothing changes while adjusting the shutter dial. I have carefully opened the lens, but I cannot understand which parts control the opening/closing of the shutter (I can do that manually, by moving the black parts, but cannot figure out the logic, which part (lever?) opens it and which one is responsible for closing). I would appreciate any help on the matter. Thanks in advance. Edited June 2, 2022 by martynas_photo 1 Link to comment Share on other sites More sharing options...
malcolm_denton Posted June 2, 2022 Share Posted June 2, 2022 Camera Repair Course | Learn Camera Repair 1 Link to comment Share on other sites More sharing options...
martynas_photo Posted June 3, 2022 Author Share Posted June 3, 2022 Malcolm, thanks for your suggestion, such course would definitely be beneficial to me. Not sure about this particular lens, though, slayed mercilessly and lying on my table breathless...:) Sorry, got carried away Link to comment Share on other sites More sharing options...
kmac Posted June 3, 2022 Share Posted June 3, 2022 (edited) The yellow arrow points to the ring that actuates the shutter leaves. The red arrows point to pins on the ring that are actuated by various spring loaded moving parts. There's quite a few springs in the shutter. It's worth checking to make sure each one of them is doing it's job. On the underside of the ring is the five pins, one for each shutter leaf. Edited June 3, 2022 by kmac 1 Link to comment Share on other sites More sharing options...
martynas_photo Posted June 3, 2022 Author Share Posted June 3, 2022 Amazing, thank you so much! Link to comment Share on other sites More sharing options...
laurencecochrane Posted June 5, 2022 Share Posted June 5, 2022 (edited) I would buy a parts lens with bad glass and change the shutter mech.. Not for the first time. A locked up slow speed escapement exploded on me once, a £40 parts lens sorted that. The faulty escapment lens was free with a REALLY good (but dirt cheap) rare camera anyway Camera shown was less money than a black one needing work. Edited June 5, 2022 by laurencecochrane 1 Link to comment Share on other sites More sharing options...
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