Hi, I recentally had my 50D cleaned by canon at their service centre in Hertfordshire. Since then I have noticed that in focus subjects are blurred in the viewfinder. To clarify, the camera will autofocus, with the autofocus indicator lights highlighting the in-focus areas. However, in the viewfinder the in-focus areas look clearly out of focus. The resulting picture is perfectly in focus. If i manually adjust the focus on the lens I can make the image tack sharp in the viewfinder, however the resulting photograph is out of focus. I have adjusted the diopter to make the image in the viewfinder as unblurred as possible, but it is still not clear enough through the viewfinder when the subject is in focus (according to the autofocus). This makes it virtually impossible to manually focus. I have had another person who has 20-20 vision check (with the diopter adjusted for them) and they can confirm that they are having the same problem - that is in order to get the image in the viewfinder in focus they have to manually focus the lens - which then results in a perfectly sharp image in the viewfinder but an out of focus photograph. I have removed the focus screen and put it back in place, to make sure it is positioned correctly, but the problem remains. This happens with all my lenses. When using Live view, the in focus areas are perfectly sharp on the LCD and in the resultant photograph. Are there any other suggestions, or would I need to take it back to the service centre? Thanks!