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Author Message   Gambit023 Tinkerer Username: Gambit023 Post Number: 1 Registered: 11-2008 Rating: N/A Votes: 0 Posted on Tuesday, November 11, 2008 - 07:11 am:    Does the camera work in the M250 and the B shutter setting? If so, you may need new batteries. The mirror will lock up in all other settings if the batteries are dead.