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Author Message   Brcamera Tinkerer Username: Brcamera Post Number: 219 Registered: 08-2010 Rating: N/A Votes: 0 Posted on Sunday, October 21, 2012 - 05:41 pm:    I would check the shutter by itself in this way: Cock the shutter and remove it from the camera body. Set one second shutter speed, aperture wide open. Looking on the back of the shutter, orient it with the small silver pin (it sticks out about 2mm) at 12 o'clock. Press in the silver pin while slowly turning the two posts at 9 and 3 o'clock clockwise and looking through the back of the lens. After about 6mm of movement the shutter blades should slowly close. The sequence will be: shutter blades will close, shutter will open and time out and then blades will stay in closed position until shutter is cocked. In any case, if there is a problem with these lenses, the shutter will have to be removed for repair and this takes a bit of disassembly. Unless you are going to tackle this yourself, the cost of repair probably is greater than replacing the lens with today's prices.. Bill