Sneaky tip on de-silivered OM prisms, - the consumer oriented OM-10/20/30 cameras used the same pentaprism but did not use the the rotting foam. So you can pick up a working or non-working OM-10 or 20 for next to nothing, steal the pentaprism from it and put in in your OM-1 or OM-2. The other OM design flaw was the accessory shoe. They're plastic and almost all of them you see around are cracked. The top of the camera is just like a log splitter and when people cranked those shoes down too tight, - they split. Usually it's just cosmetic, but sometimes worse. In spite of these flaws I love the OMs.