I posted a thread under this title over on the Processing Forum. I include links to a special comparative view of what DxO seems to do to my Nikon D50/Sigma 18-200 combination. The program claims to correct for the deficiencies of both camera and lense for specific combinations of cameras and lenses (which they list on their website and are adding to pretty regularly). D80 and D200 customers are especially well served. I have no affiliation with the company...don't even own the software. I just used the 21 day evaluation copy they have made available. But for somebody like myself who right now can't afford the very best lenses, this may be a godsend if your combination is included.