Okay here is an example shot with the lens cap on Shot in RAW. Same thing. Lots of graininess on the top and bottom of the frame but not as much in the middle (relatively speaking). The image is at ISO 3200 and I added +1.09 exposure comp before converting it to a JPEG in order to accentuate the effect I am seeing. Has anyone else experienced this with their K20D? I am sorry if I sound ignorant I have just never seen this before =(. I just want to make sure I do not have a defective sensor. Thanks again!