Currently, my Canon Rebel Xti works in manual focus mode only.
Since the Canon EF lenses do not have aperture rings, it will be pointless trying to use those in manual mode. Instead, I bought a cheap Canon EF-to-Nikon F-Mount adapter. Now I can mount some old Nikon lenses that do have proper aperture rings.
Here is the cool thing. The Canon will meter with the old Nikon AI lenses. Same with the old Canon FD lenses and everything else (with adapters), the Canon will meter without any electronic or mechanical contact with the lens.
At this point I’d like to point out the great irony that no Nikon fan will want to talk about during the heated Canon vs. Nikon debate:
Nikon and its fans boast and pride themselves for having the ultimate lens compatibility with the F-mount and most will claim that any Nikon lens ever made since 1959 is compatible with modern Nikon cameras. This is simply not true.
– Most Nikon F-mount lenses produced before late 1970s must be modified to mount on modern Nikon cameras.
– Any non-G Series auto focus lenses will not auto focus on many of the mainstream modern Nikon DSLRs unless the camera has a built-in focus screw (D90 and up).
– And most importantly, with the exception of few high end models, modern Nikon DSLRs do not meter with the old manual lenses. The Canon does!