Bottom-left border: 200/4 QC's CA correction
The only weakness of the old 200/4 QC is the CA at extreme harsh contrast conditions, but this is easily fixed in PP.
A simple CA correction at the conversion (NEF to TIFF) phase in the free sofware ViewNX2.7 - auto axial CA (50% default amount) is enough to fix the bluish-purple fringe.
The best of all at zero cost on sharpness.
200% crop
D600 + lens wide open (f/4) + tripod, live view focused, mirror lock up + remote shutter.
Bottom-left border: 200/4 QC's CA correction
The only weakness of the old 200/4 QC is the CA at extreme harsh contrast conditions, but this is easily fixed in PP.
A simple CA correction at the conversion (NEF to TIFF) phase in the free sofware ViewNX2.7 - auto axial CA (50% default amount) is enough to fix the bluish-purple fringe.
The best of all at zero cost on sharpness.
200% crop
D600 + lens wide open (f/4) + tripod, live view focused, mirror lock up + remote shutter.