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Old 29-12-2013, 09:13 PM
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acropolite (Phil)
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Join Date: Feb 2005
Location: Launceston Tasmania
Posts: 8,992
I tried 2 copies of the Sigma 12-24' both were attrocious on my 5DII. Sharp in the centre but unacceptably soft on both sides , worse on the left of the frame. Apparently with ultrawides lens alignment is critical and even minute misalignment between the sensor and lens can cause soft edges, so a lens that's bad on one camera may be OK on another of the same model.

I have the 16-35 F2.8L it's a decent lens, if you pixel peep it's also a little soft on the edges but overall it's OK. One advantage of genuine lenses is that DPP has profiles to correct for flaws such as CA and vignetting.

I'd be tempted to go for the Samyang, the distortion can be easily tuned out as can the vignetting.
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