Had a 450d for several years. Shot lots (!) of images with it. Had the usual focus challenges - nothing I could not explain or learn my way around. Recently upgraded to a 7D. Very happy with it overall. All my lenses are fine - but one. that one just does not focus right - and it is not really a small or subtle thing. No pixel peeping necessary to see it - you can tell right on the camera LCD.
I've tried it under controlled circumstances, and it seems to happen at distance - near infinity focus. I've messed up a couple of great photo outings figuring this out.
I've not yet gone down the MA path (actually I have with most of my lenses, but I need to devise a good way to do this at a considerable distance for this lens). None of them required much tweaking.
I'm trying to decide if I have a lens issue, a body issue, or if per chance the lens just might have been damaged recently (since I got the new body). I suppose I should dig out the 450d and see what it does there.
Have any of you experienced such a thing, moving between bodies?
Any great ideas at long distance MA?
Welcome any and all thoughts.