talking about focusing screens, I'd like to change the focusing screen of my 50D as as well . Does anyone know which one will be good? I had been having problems with focusing when i do it manually it's sharp on the view finder but as i took the picture, the photo taken is not in focus. On low light situations where I cant trust the AF or it just dont work, manual focusing is a pain since all shots taken were off but on the viewfinder it's crisp clear.
people have said good things about these
but they dont do them for 5D mk2