I agree with the idea to shoot both wide open, and both at f/1.8.


Looking at the bottle shots, the in-focus plane is different - depending on where you were trying to focus, the Sigma needs AFMA or the Canon needs to be re-AFMA'd. With the Canon the numbers under the barcode are sharp, with the Sigma the words above the barcode seem in focus but less sharp, but they seem less sharp (but they're on a curve, too).


Quote Originally Posted by ddt0725
...I am just testing lenses for AF, sharpness and contrast.

It's a bad idea to test all of those at once. If the AF of one lens is off (i.e. needs AFMA), it will look less sharp than another lens with accurate AF, even if the more accurately-focusing lens is actually less sharp. So, to test for sharpness and contrast, use Live View and 10x magnification to focus on the same spot with each lens. Test AF performance separately (ideally, after AFMA).