The Sigma 24-70mm f/2.8 DG DN II promises big improvements over its predecessor, but does it live up to the hype? Let's break down its performance, sharpness, autofocus, and value. #Sigma2470 # ...

At 28mm, central sharpness is very good all the way through from f/2.8 to f/22. The edges are good at f/2.8, very good from f/4 to f/16 and just fair at f/22. At 35mm, central sharpness is very ...