Rate this post by selecting a number. 1 is the worst and 5 is the best.

Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 452 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Tuesday, December 11, 2007 - 09:38 pm:    If you have not removed the screen in an OM1: Remove the lens. At the front center of the focusing screen, there is a small tab that hangs down slightly below the screen frame. Pull this tab forward slightly with your finger, and the frame will drop down. The frame is hinged at the rear, and spring-loaded downward, so it will follow your finger down as you gently lower it toward the mirror. The screen will come down also, lying on top of the frame. Remove the screen carefully and place it on a clean cloth. Now, look inside the camera - the mirror gives you a good look up into the prism - and see if you see any loose object under the prism. Also looking up into the prism, if you see a pattern of black marks running front-to-rear in the center, this is deterioration of the silver along the peak of the prism, indicating that the prism needs to be replaced.