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Well this Sigma is pretty iffy even on APS-H. :-) I would not have gotten it if I had stuck to APS-C cameras, of course, because what's the reason to get it when there are dedicated crop ultrawides that go wider, have filter threads, zoom and give better optical quality. :-)
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Klaus, how would you compare Sony to Laowa 15mm F2?
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Well, look at the charts. :-) The Sony lens is a magnitude better.
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Yeah, I guess Canon 10-22 / Nikon 12-24 introduced shortly thereafter solved the problem (for most people) in one fell swoop.