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Author Message   Ph0t0n Tinkerer Username: Ph0t0n Post Number: 9 Registered: 11-2006 Rating: N/A Votes: 0 Posted on Saturday, March 22, 2008 - 05:59 pm:    This happened a few weeks ago. I haven't tried to fix it yet, but noticed that when the GN setting on the lens is set to a high number and focused close, the blades appear to stop down to f/16 or f/22 as appropriate. FWIW, changing the aperture ring from 2.8 to 8 and back again causes the apertur blades to MOVE slightly (side to side; not close-open). Almost feels like something needs to be tightened. Am I stuck shooting this at f/8 and wider? (could be worse, I know.)