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I welcome IS on the new 100mm macro lens - it was always a pretty stupid design faux pais from Canon not to have it to be honest. Especially if your using a 1 series body with weather sealing, you'd want integrity of the whole setup. That said, the Sigma and Tamron lenses are very good. I haven't heard much about the Tokina so can't say much.
I'd definitely stick to lenses in that focal length - shorter ones like 50mm/60mm do not give enough working distance imho. Longer ones like Sigmas most excellent 150mm give plenty of working distance but suffer from being bulkier and far heavier, making it more difficult to manage the lens/camera. I actually use a Sigma 150mm and Mark IIn, so my setup is very heavy. It takes a *lot* of practice to get good at it, especially with such a heavy setup. A lot of macro shooters use smaller camera/lens combos - I know LordV uses a 40D and Sigma 105mm or MPE-65, depending on what he's shooting.
Dave
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