Have fun with the new lens, KA734! I'm sure you will not be disappointed.
Today was "axial color day" with the new lens. Axial color also called "longitudinal CA" (loCA) render subjects in front of the plane of sharpest focus in a magenta tint and subject behind that plane in a greenish tint. The effect is reduced when stopping down the lens.
It is one of the problems that often occur with large aperture primes. Nikon's latest f/1.4 lenses like the 85/1.4G
had plenty of it. It could be corrected in post, but it's not as easy to clean up as lateral CAs. CaptureNX has a routine for eliminating loCAs, but if you turn it up to 100% it is not without side-effects.
The new 50/1.8G turned out to be low on loCAs which are almost gone at f/2.8 and beyond. It is clearly better in this respect than the 50/1.4G. See the results below, 50/1.8G first, followed by 50/1.4G (this is reproduced slightly below 50%, to access the large 100% original click through the image):
On a side-note: if you look closely, you might find that there is a jump in "background-sharpness" when stopping down from f/2.0 to f/2.8 while the foreground is almost unchanged. As focus was achieved manually in live-view at f/1.8 and not altered when stopping downn this is a clear indicator of focus shift to the back.
The 50/1.4G sharpens up more regularly when stopped down.
Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews
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