"One thing I'm curious about too .. is how well does it correct for distortion.
That is, if the lens has a complex distortion type, for example with a wave form rendering .. is the DC application to counter this, or just simple barrel/pincushion application?
I'm not sure if I have any images to test with. Possibly some taken with the 18-105VR at 18mm .. but I think I may have deleted most of them."
It corrects the complex distortion of my Nikon 12-24mm quite well; if anything there is only very slight remaining barrel distortion for moderate distant subjects.
Yes, lenses released after the last version of CNX2 are not supported even with firmware update, so a capture with my 300 PF for instance does not show auto-distortion as an option in CNX2 (not that it really is needed for that lens though).