On my focusing screen.....it's a small hairline crack. Not the end of the world but I wonder how much of a pain it will be to change. I remember my old F's there was a button to release the Photomic T finder and then another release for the focusing screen. You just up ended the camera and dumped the screen out onto a soft towel etc. cleaned it or replaced it, done deal. Anybody ever changed one on a D40?