A word of caution. AF focussing screens make working with MF lenses on Canon bodies a bit of a chore and can be an exercise in frustration, particularly with fast lenses. When the digital Rebel came out in the early 2000's I bought one to have direct-to-digital files with which to work. All of my cameras up until that point had been Nikons, so all of my glass was too. Although the greater flange-to-sensor distance of the Canon camera made adapting the Nikon lenses pretty easy, focus was a constant hassle, and particularly with indoor, dimly lit, shots I missed focus more often than I nailed it. I thought that the problem was the Rebel's tiny focussing screen, so when the Canon 5D came out, I jumped on it. The results were no better. Film SLR's back in the day had fairly coarse ground focussing screens and usually had a focussing aid in the center, like a split image or micro-prism (or both). But with the advent of autofocus, focussing screens almost universally went to a high-contrast fine-grained screen with no focussing aid. This makes nailing critical focus difficult.
