Quote:I think it's some copyright issue. Had that, too.
For the Sigma, I expect a battle price - but I have to admit, in terms of sharpness over the field, the new (and very expensive) Nikkor 24-70/2.8 is very impressive, if you look at Mansurov's sample pictures.
The 24-70 Sigma has M82 filter, the 24-105/4 M86. What I don't like with both is the very dense distance scale. For me, it's sometimes difficult to adjust focus although the focus ring has a gear ratio.
The 24-105A has 82mm filters as well. It looks like standard practice now for f/2.8 standard zooms (with the exception of the Sony A-mount which is the only one still sticking to 77mm) but rather novel for f/4 ones.
