Hi, I'm looking for a little help with my newly aquired SL35+50mm Planar 1.8. The problem is that I can hardly see when I'm in focus or not, the focus screen looks clean enough but never gets really sharp, there's no split prism to help either and the screen is non-interchangeable anyway. Although the viewfinder eye piece looks standard and un touched, I wonder if some one could have fitted a personal diopter eye piece? Another thing is that I bought the camera and lens from different sources, the lens I think may be much more recent than the body, I think it was intended for the 2000, 3003 (?) series of system cameras, though the bayonet fits fine, could there be a compatibility problem here? I include a pic of the ticket which came with the lens (seemingly new in the box). Thanks, Pitxu.