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The firmware update did not solve the banding problem, the first frame from last nights run was still showing the single strip down the left hand side of the frame. Hmm, maybe it is a sensor issue after all. Too many pixels into a 1.6 crop is showing its weakness with astro imaging.
Interestingly the 50D is a fantastic terrestrial camera, I've seen no issues at all there. I suppose that's what I mainly bought the camera for in the first place, I have a Baader modified 350D for astro work. I have not seen anything strange in the 350D shots so I might as well just stick with that for the time being.
Michael
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