Quote Originally Posted by mgb74 View Post
As noted above, many OMs have foam on top of the prism that deteriorates with age and eats through the prism silvering. If this has happened, you'll notice dark "wisps" or threads as you look through the viewfinder.
This was only a problem on the 1's, and it is easy to fix. Olympus realized there was no need to "seal" around the eyepiece and eliminated the foam. My OM-2n was the first of much (far too much) OM gear, bought slightly used in the mid '80's. It has never been serviced and works like a champ.

One day, God wanted a camera. So he made the OM's.