5 out of 10 points and not recommendedCheap, small, wide apertureVery soft image at f2.8, build quality, noisy AF
Not worth the money spent. Bought this lens for my EOS 40D after reading numerous praises throughout the internet. However to my dismay images at f2.8 were very soft and not up to my expectation. Even after stopping down to f5.6 the sharpness only improvess a little. I sent it back to Tamron Service Centre (UK) for recalibration but the IQs remain the same: disappointing.reviewed May 27th, 2009
I continue to use it until I bought the EF-S 17-55mm f2.8 and when comparing between the two it was like heaven and earth! The build quality and IQs of the EF-S lens are much better than this lens. Images taken with the EF-S also extraordinarily very sharp even at f2.8, rivaling the sharpness of my beloved EF-S 60mm Macro (although not up to the standard considering that this is a very sharp macro lens!)
So if you are looking to buy this lens please look at other alternatives first like the EF-S 17-55mm even if they are much more expensive. In the long run IQs of the images are much better and IMHO worth every cents spent.