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Brian - looking at your exif data, you're on firmware v2.0.4, and mine is on v2.0.8. Maybe it won't fix anything by upgrading, but it's worth a shot given the hassles involved in warranty return. I think that you may have a problem with that, as lenses carry international warranties, but not bodies. I really hope that you can work this out with Canon.
Irrespective, I just took a 300-sec dark at ISO800 (same as your shot) and I have none of the banding problem. In fact, you can see by the position of the levels sliders that I've stretched it all the way and am JUST beginning to see hot pixels.
Dark: 300 sec, manual bulb mode, ISO800 - stretched to the proverbial:
Last edited by Omaroo; 31-12-2010 at 10:31 AM.
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