03-30-2015, 07:41 PM
The sigma 17-70 is less complex, as zooming may be done on both sides of the aperture stop (non-constant aperture), is larger, and has more spherical aberration. It does have significantly worse build, at least externally, as well.
To be clear, I do think the 16-70 is a poor lens, but I also think Imatest is overstating the weakness of its performance as well.
To be clear, I do think the 16-70 is a poor lens, but I also think Imatest is overstating the weakness of its performance as well.