[mst]

Saw markus comment about apo - i think that apo lenses significnatly reduce the fringing; however I'm not sure he is describing bokeh frinign or sensor bloom (purple on water); I think the thought on sensor bloom is angle of the light.

Definitely bokeh fringing... was able to change it from purple to green with the focus ring But yes, you're correct otherwise, APO lenses show a lot less of it, but not none.

However, for real-world use, it's probably safe to say that with most APO lenses and most common light situations, bokeh fringing is usually not an issue.

-- Markus