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Sigma SuperWide Dilemma


I can't decide between the Sigma 15-30mm f/3.8-4.5 EX DG-D Super Wide Angle Zoom and the Sigma 20-40mm f/2.8 EX Aspherical DG DF Wide Angle Zoom.

Both are similarly priced, but I think I can get about $90 off of the 15-30.

One logic is that the faster lens is the better lens, but I've also heard that this logic is overstated. The wider lens might prove more useful.

Help! Please!