Title: Read dpreview before you buy
Product review: Mechanically well constructed. Come with pinch-type lens cap and hood, as well as boxy carrying case you can thread onto a belt or rigging.I wasn't going to spend extra money for the Canon glass since I anticipate using this lens only occasionally. I figured I'd go with the Sigma over the Tamron because the Tamron is a 77 mm filter while the Sigma shares a 72 mm filter with my main everyday lens. I fully read the review on dpreview about the lens' performance at various apertures, but I wasn't prepared for how soft the picture looked at 10mm F4! Don't rush to return your lens if you're surprised by the poor quality of the test shot, try F11 or F13 where the lens performs the best. This does mean that I'll have to be more thoughtful capturing a landscape than just setting the aperture to F22 and firing away. No quality problems in my copy when stopped down, unlike other mentions here.
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