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Author Message   Eurekaiv Tinkerer Username: Eurekaiv Post Number: 10 Registered: 11-2011 Rating: N/A Votes: 0 Posted on Thursday, August 02, 2012 - 03:22 pm:    The blades are fine... clean and moving freely with no issue. Perhaps I didn't explain it right. When you press the DOF preview button in, the lever that moves the aperture on the lens pushes the aperture closed, but does not return properly of its own accord, or returns very slowly. The video shows how this is happening.