Originally posted by Philoslothical 
It would be worth trying again using center weighted metering, just to see what happens. Wide open, and maybe f/4 and f/8. When you have the aperture ring stopped down on the lens, and you manually move the aperture arm, is the diaphragm snappy when you let it go?
I think the aperture arm was getting hung up, it seems to be working ok now--it was on center weighted metering when I used it & the shots weren't blown out. I bought the 50, 28 & 135 in 1976 to use on my ME that I still have--I'm pleasantly surprised at the results of these old horses!
Thank you everyone for your responses & advice.
Ok2day
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