Hi, A friend asked me what might cause this banding in his photo, which he took on his 450D. I immediately thought it was pixelation from taking the image on a small setting or something similar, but he assured me that it was taken on his highest setting. Could someone please take a quick look at it for me and tell me what you think? I've listed the metadata in the second link.
Also, he mentioned he used a circular polariser, but although this would explain circular rings in an image, I wouldn't think that it would give that "chunky" appearance. Surely this is a data issue?