My Canon glass isn't so hot on the 1Ds Mk. III...

I have found that micro adjustment is mandatory on my 1DsIII. I have the 85 f/1.8 too and it's a lovely lens but is completely blown away by the 100mm IS Macro - for only a minor change in focal length. Once adjusted I am happy with my 24-105mm as the walk around lens and I tend to then carry to 100mm and the 50mm f/1.4.

I threw my old 80-200mm f/2.8 in the bag when my colleagues went ice skating without doing any previous micro adjust and I *know* it's a good copy but the shots were far too soft (even when compared to the 24-105mm in the same conditions)... that'll teach me.

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Peter Galbavy