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My first Sigma. Tried a few last year for my Rebel XT, but all suffered from a front focus problem. Now, tried the 12-24 with my 5D and was blown away. Sharp across the range, good contrast, colours and everything. A real gem. Was expecting to try a few copies (read other posts on quality control or lack of it), but the first one was the one. The serila number is 2005xxx. Maybe Sigma has gotten their stuff together. Very happy with this lens. My other lenses consist of none L lenses (being not a professional and supporting a family), being Canon 50 mm/1.8, Canon 24/2.8, Canon 70-300 IS, Tamron 24-135 and Tamron 2X. Highly recommended.
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