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How do I get to the diaphragm and shutter on this bitch?
The front of the lens resembles a swiss watch, and the rear has a spot for a spanner/something but Im not sure if it's threaded to something else causing it to stay still - I cant move it easily with a screwdriver but I dont want to break it. Do I just need to go full retard?
A leaf in the diaphragm and shutter need to be adjusted/replaced. (You can find a repair manual if you search for it, if you need some more mechanical details)
It's a petri 7s
