Quote: I was going to sell my MZ-7 and was cleaning the dust off the outside and checking the mirrors, and focusing screen, come to find out there is a scratch on the focusing screen I didn't see when I bought it. Too late to return now, but that's why I was getting those spots on my photos. So, unless I can find a focusing screen to replace the scratched one, I have a paper weight.
That's most likely not the problem. The focusing screen has no effect on the final photo produced (except for metering), so even if you have a focusing screen ridded in scratches, broken in pieces, or even simply just not there, pictures will turn out fine spots-on-the-photos-wise...
So no idea what's causing spots on your photos, but that's not focusing screen...