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I have only read a few snippets about the new 17-50mm F2.8 VC. For the most part, they have said that it's not any better than the non-VC version, and might be a little worse.
By all accounts, the Canon 17-55mm F2.8 IS, is a fantastic lens. Image quality on par with just about any L zoom lens.
dom yo said:agree on all accounts. i used to use a tamrom 17-50mm f2.8 vc. it's not really a BAD lens. but it doesnt hold up to the quality of the canon 17-55mm. what camera body are you using? you might want to take a look at this article.
Canon Officially Acknowledges Lens ID Issue « Canon Rumors
dom yo said:there is no remedy. it still works for the most part, it just does not utilize the cross type AF points which isnt really a "have to replace the lens" situation.