The lazy diaphragm problem John mentioned above is quite easily fixed. I had a 50mm f1.4 like that. I thought it was caused by oil on the aperture blades, but it’s actually more straightforward. There is a moving part associated with the aperture control that becomes stuck with dirt. You can access it quite easily from the back for cleaning. Putting it back together needs some patience, but the whole job took me about half an hour. There are instructions on the internet if anyone’s interested.
Alex.
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