[JJ_SO]

Thanks, obi can. Interesting, how "all of a sudden I bumped into this strange behaviour" becomes a method to check a lens. The fountain spray is something useful, I think. Some fountains do have green parts of environment around, so the green part of fringing os less of an issue. But purple or magenta is not seen so often in real and drags a lot of attraction even at thumbnails. Another unscientific method: if the thumbnail shows magenta where it shouldn't, it's too much of it in the picture.

The good thing is as well: I always try to tell people "rent the lens and see if it works for you". This time it cost me two rentals and saved me 1600.- max If I had bought the Nikkor at the dealer I rented it from, they would have reduced the price - but the lens is 400,- more expensive there, so it would not even cover the price diff.