>As already pointed out, all wide angle lanses suffer from >distortion at the edge of the picture. This effect, called >volume anamorphosis is not caused by lens distiortions, but is >due to the laws of optics. The DxO Pro software is to my >knowledge the only program that effectively corrects for this >effect:
I'm having very good luck using the Adaptive Wide Angle filter in Photoshop CS6
>I use the Nikon 14-24/2.8 which is the best wide angle lens >available from any manufacturer.