scobols wrote in post #9914531
How is the Sigma in regards to CA? Is it any better than the Canon? Nobody ever seems to talk about that.
It is there and very noticeable at wide open apertures, and personally I find it a bit worse than the 2 Canon lenses I had had. Others will point out reviews that show that it has less, but I am not sure. I will just say it is about the same then. But it is very noticeable, whether it is less or more than the Canon.
Also to those that fear getting a Sigma that front or back focuses, I would rather send in a Sigma for calibration under warranty than to send in a Canon that is outside of warranty for the dreadful AF track deflection that causes AF to fail. The latter situation is just too large a risk for me and the Sigma IQ looks better too.