I can’t quite justify the expense of investing in a Tilt & Shift lens just yet so I have started tinkering with Photoshop CS2's lens correction functions to fix perspective and lens barrel distortions. They worked very effectively but in doing so created some quite severe chromatic aberrations notably in the red channel that were not on the original image. I managed to get rid of them with the clone brush but I was wondering if anyone else had come across this as a bug in the software or whether it was a one off oddity peculiar to this image.

I can only see actual chromatic aberation happening with a real lens. It is probably the case that the correction algorythm is enhancing the existing chromatic aberation from your lens. The solution would be to get a better lens.

It's a Canon EF28-70mm f2.8 L Series lens - it doesnt get much better....

but your right - the extreme correction could be amplifying a minor aberation....

I use those corrections quite a regularly in CS2 without inducing any aberrations. I might be a peculiarity of that image.