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Message:: [QUOTE="-jeffB, post: 6809240, member: 27832"]Yep. There are some EOS lenses ("EF-S") that will only work on the small-sensor cameras like the Rebel series; others will work on both crop and full-frame bodies. You're most likely using either the 100mm f/2.8 macro or the 100mm f/2.8L IS macro; both will work fine on any body. I've got several lenses that won't work on the 6D II body, but the only one I've really missed is the 10-20mm wide-angle. But the movement toward "mirrorless" bodies is gaining steam. You can use the old lenses on those with an adapter, but lenses designed especially for the mirrorless R-series ("RF") tend to be smaller and lighter for a given focal length and aperture, and there are some lenses for the RF platform that would be prohibitively heavy and expensive, or downright impossible, on the EF platforms.[/QUOTE]