Fstoppers Review of the Canon 24-70mm F/2.8 L II. Reviewing this lens has not been a simple task. As is the case with, say, a new Apple product, many can argue that the original 24-70mm f/2.8 L
The Sigma 17-70mm f/2.8-4 DC Macro OS Lens controls vignetting quite well. With a wide open aperture, expect to see about 1.5 stops of peripheral shading in the corners. Stopping down to f/5.6 removes much of the corner shading and by f/8, only about .5 stops of shading remains - even less at 70mm.
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canon ef 24 70mm f 4 review