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Author Message   Qaeng Tinkerer Username: Qaeng Post Number: 13 Registered: 04-2007 Rating: N/A Votes: 0 Posted on Wednesday, February 13, 2008 - 02:19 pm:    Having completed a little investigative work, it seems that the stop-down lever in the mirror box isn't exerting enough pressure to push the aperture pin on the lense far enough to complete a shutter cycle. The aperture blades on two lenses I've tried so far snap fine, and the problem persists regardless of which one I use during cold weather conditions. Oddly, with no lense mounted, the camera can complete the shutter cycle on its own even in the cold. Is there something in the lever mechanism/ linkage that I could clean or lube to loosen things up a bit? Thanks to any responders.