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Dono T wrote:
Get the sigma 12-24 mark 1. I haven't tested one out myself but currently working on this dilemma. Its rectilinear corrections are supposed to blow these other two out of the water and you save a ton of money. The downfall is softer corners, variable aperture and not weather proof. Apparently the mark ii went downhill on it's rectilinear abilities.
No really don't get the mark 1. The mark 2 is much better from the samples that I've seen - but having actually owned the 12-24 mark 1 (on full frame), I can only advise you to run. Very low contrast and sharpness, and the distortion is pretty crazy. It was questionable when it came out in 2003, it's quite awful today.
I'd get 17-40 for normal stuff if f2.8 isn't an issue. If you need f2.8 then you don't have a choice.