<The first thing is that ALL USM lenses work on ALL EOS bodies. I don't
<think that is true with Nikon's AF-S lenses.
"Every" Nikon F lens can be fitted in "every" Nikon body wich is not the
case in Canon (FD and EOS). That said, to be fitted does not mind "every"
functionalty of any Nikkor lens does work in all Nikon bodies. Obviously AF
does not work in MF bodies, but metering(matrix or evaluative) is different
if the lens is or is not "chipped" and if it is AI(Aperture Index lens to
body connection) or not, and some bodies cannot use AFS(USM) nor VR(IS)but
they can be hadn focused. Overall is a wider phisical compatibility but
lesser functional compatibility. I can use a 80-200 AFS lens bought in 1999
in my 1961 Nikon F and, more important, I can use, and I do, in my Nikon F4
a arsenal of really good MF primes keeping the matrix (evaluative) metering
and having a outstanding electronic rangefinder. Not bad.
A more precise reponse about compatiblity will be too long but the main
ideas are here. Every system has advantages and inconveniences. Right now I
am however much more interested in getting a new 24-105L IS 1:2.8 (a dream
zoom) for my EOS 1V than in new Nikkor lenses...
Kind regards
Felix
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