jdizzle wrote in post #16134057
.... Vignetting seems to be a characteristic with Zeiss but, I don't think it's a bad thing.
I think they've broken their own record with this one though.
Whether it's bad or not depends on the scene. Correctly expose for the centre and you've lost three stops at the edge which isn't good if there are shadows there. Expose for any corner shadows and there's a chance you'll blow some central highlights. +1 in the centre and -2 in the corners might work. All that said, at f/4 it's ceased to be an issue for all practical considerations.
1Dx2 (2), 5DSR, 1Ds3, 1D4, 5D2(590nm), 5D2(720nm) EF600 EF400 EF300-II EF300 EF200 EF200-II EF180L EF135L EF100 EF85-II EF50L TS-E17/4 TS-E24L-II TS-E45 TS-E90 MP-E65 EF70-200-II EF24-70/2.8-II EF16-35/4 EF8-15/4 EF11-24/4 Zeiss 15/2.8 21/2.8 25/2 28/2 35/1.4 35/2 50/2 85/1.4 100/2 135/2 T/C's L-SC & a WIFE!