Some people are going to be a bit disappointed (I admit I am a bit myself) because they really wanted a zoom that was every bit as good as their prime lenses. What we actually have is a zoom that’s as good at f/2.0 in the center as their prime lenses, but like almost every other zoom isn’t quite as good as a prime off-axis. When even the best optical engineers (and lately Sigma seems to have some of the best optical engineers) design a wide-aperture zoom lens, some compromises have to be made. In this case there’s a lot of astigmatism away from center. There’s good news for you who are disappointed now: Computer image analysis (like Imatest and DxO) don’t show astigmatism directly so this lens will probably look better with those test results than it does on the optical bench.
But whether you love the lens, hate the lens, or don’t care about the lens, I think we all should give Sigma a thank you for having the guts to create the lens. The bar has been changed. An f/2.8 zoom lens isn’t the fastest zoom anymore. And all of us can appreciate the ripple effects of a game changing lens that’s priced as aggressively as this one is.
Read the full review at LensRentals.
Sigma 24-35mm f/2 DG HSM Art Lens for Sigma SA: $999 at B&H Photo, Adorama