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90mm elmarit 28 ring diaphragm probl


Active Member
I've just bought a 90mm elmarit very cheap, (about $85). I did not think very much before paying because it was not a great expense. However, it appears to have some difficulty to turn the ring diaphragm, especialy closing it. When in 22 its almost OK to run to 2.8. Any suggestions on how to fix it ?