Not used those or indeed any sigma lens Tel. I did try a wide angle in jessops a while back, it felt cheap and the zoom action was really stiff.. but that could equally describe most Canon stuff also and doesn't really mean it's crap. Check out fredmiranda and see what other people say about those lenses..
You can pay loads for proper canon lenses but it doesn't mean you'll get better results at all. There are of course lenses to avoid but I think you'd spot one of those with a quick read on something like the miranda website. I think theres a canon-only site with lenses reviewed but I dont have the url to hand.
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