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Tamron 17-50mm F/2.8 XR Di II LD Aspherical [IF]

1750diII
Review Date: Apr 14, 2007 Recommend? yes | Price paid: $449.00 | Rating: 10 

 
Pros: Very sharp, great color/saturation/contrast, f2.8, comes with the lens hood, about $200 cheaper than the 17-40L and one whole stop faster and wider to boot
Cons:
Focusing speed and accuracy is not as good as Canon's USM, soft corners and CA (but never bothered me)

The pictures are very sharp and the colors are very good (on the warmer side, I'd say, but not as warm as a Sigma). Focusing speed is acceptable for most wide-angle use. Decent build quality, but its no L. Some people like it because its fairly lightweight. Last but not least, it comes with the hood, and all for $449 MSRP!

Although I said focusing speed as acceptable, it is not good enough for action, in my opinion. Focus mechanism does make more noise than Canon's USM, but its not overbearing. Common complains include CA and softness in the corners, but to be honest, in reviewing my own images shot with this lens, I've never thought these to be major issues.

AF accuracy in low light is not as good as some of my other Canon lenses, but its definitely acceptable (I had a Sigma 18-50 EX that I found totally UNACCEPTABLE).