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I have the 17-55 F2.8 - wonderful lens. Very sharp and very little CA. Is subject to flare though that could be due in part to my using a UV filter in front. There were reports (at least early on) that this lens was prone to sucking in dust inside the lens. I have not seen any dust on my copy, and it is pushing 3 years of use, and on order of at least 10 K actuations.
Use it with a 40D.
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