Originally posted by Canada_Rockies Did you perhaps put the shim on the focusing screen on the wrong side of the screen when you replaced it? Easy to do. I had to install my new screen twice. Once wrong, once correct.
Oh - sorry, I knew I forgot to mention something. This would be the most likely explanation, however, I've tried reinstalling the screen a couple of times without any difference in results (awkwardly, I got the screen almost as soon as I got the camera, so I don't know if it had this problem before). It only really seems to fit in one way - but it's certainly possible that I'm consistently making the same error, so if you have particular advice about what signs of this problem I should be looking for, I can poke around and see if that's it. In any case, thanks for the suggestion.