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Sigma 15-30mm f3.5-4.5 EX Aspherical DG DF

15_30f35_45_1_
Review Date: Oct 17, 2011 Recommend? yes | Price paid: $265.00 | Rating: 9 

 
Pros: Sharp, accurate focus, nice color, well built.
Cons:
Some vigeneting on full frame, but easily corrected. Need to watch for flare.

I am really quite impressed with this lens on my 5d. It is sharper than I expected with no decentering at all. Sharp to the edges with the exception of the extreme corners, but overall an excellent performer fo an UWA. It is large, but not too heavy. I find the focus plenty fast and accurate enough. There is some viginetting, but this is common in similar lenses as well and very easy to correct. The len's biggest drawback is lens flare in certain conditions, but this can also be worked around. Overall a great performer for the price paid!