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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 413 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, October 21, 2007 - 04:26 pm:    I don't see the picture showing the marks on the diaphragm ... generally, if the blades stick it's because they have oil on them. This is usually visible, but in some cases it's in the actuating ring or somewhere that you don't see it through the lens. In either case, my first guess would be to clean the diaphragm.