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Sigma 12-24 vs 10-20

I have been interested in obtaining a wide angle zoom to use with a D70s/D200. I have been reading reports on the sigma 10-20 and 12-24. I have been a bit concerned by some user comments regarding image softness, It may be worth looking into this before going ahead and spending hard earnt money!
Hope this may be of some help.
Steve
Hope this may be of some help.
Steve