I noticed in some pictures taken with my Canon Digital Rebel XT that there is a banding/striping pattern showing up in dark areas of a lot of shots. I was shooting in a high (800) ISO in a dark setting using the night portrait mode mostly. Has anybody else experienced this issue? It something wrong with my camera or is this just a characteristic of the camera?
I have attached an example of what I am talking about. Look at how the well lit areas are fine, but the dark areas have the stripe pattern.