I have the sigma 17-70 which seems pretty good and gets good reviews, I use this all of the time (its my only lens Lol) but will be pairing it with the canon 70-200 f4 as soon as finances allow. Gets better reviews every where than the sigma 70-200 f2.8. Canon lens can be picked up 2nd hand for bet £600-700. I was surprised how much lighter than the Canon f2.8 it was when I looked at both at the photography show. the 2.8 is a fair lump to lug about.
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