[JJ_SO]

Of course you will always see vigetting. Many aspects contribute to that. But here, I bet the small mount diameter constrains the optics a lot, contributing to the extreme vignetting. 2 stops loss in the corners or 4 stops, that is a rather big difference.

No denying here.

On the other side, the Z-mount is really big - but when I use the 14-30/4 S and compare it to the same picture made with the 14-24/2.8 Art, the Art shows much less vignetting than the (already software corrected) genuine S lens. And not only wide open - at regular apertures like f/5.6...f/11. A bit weird, I have the feeling Nikon promised something else 

14-24/2.8  f/10:



14-30/4  f/10: