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p.1 #8 · p.1 #8 · New Canon lenses used on older Canon bodies? | |
A sharper lens will provide sharper images on any camera than a less-sharp lens on the same camera, regardless of lens and camera ages. The overall resolution of a camera + lens system is the comined resolution of the two components. Actually, the reciprocal of the system resolution equals the sum of reciprocals of the individual components, but that's just a detail.
As Rob mentioned, the EF lens mount is pretty much completely backwards-compatible, and so a new lens with better IS than an older version of the 'same' lens will have better IS on all cameras, old and new. The newest lenses with 'super fast' AF might not work as fast with old cameras as with new cameras, but they'll still work just fine.
The AF MIcroadjust capability of new cameras allows you to tune each camera to individual lenses, and so optimize sharp focus, but in most cases it's not a large adjustment. With an older camera, if you have a lens with significant front- or back-focus, you send it in for a checkup. With a new camera, you can often AFMA-away the problem.
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