canon 1d + 450d lens

All Canon dslr cams use EF LENSES and added to that all 1.6 crop bodies can also use EF-S Lenses as well as EF Lenses
 
The only exception might be some of the very long "L" series lenses. Not sure there is enough room in front of the mirror on the 450/500 type bodies.
 
The only exception might be some of the very long "L" series lenses. Not sure there is enough room in front of the mirror on the 450/500 type bodies.

All crop bodies have smaller mirror than 1D / 1Ds / 5D series. Why would there be a problem, did you look it up somewhere, maybe you could give some references to back your statements?
 
The only exception might be some of the very long "L" series lenses. Not sure there is enough room in front of the mirror on the 450/500 type bodies.

What has the length got to do with it?
It all about the mount the lens will fit all EOS cameras
all EF and EF-S mount lenses will fit the crop sensor cameras but only the EF will fit the full frame sensor like the 1
 
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