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Hi All,
Well thanks for all the comments & ideas, FRINGE_Dweller- I can see the banding you mean, ISO-1600 is a touchy setting for Astrophotograpy ive found, even after DF removal results are never as good as when ISO 800 or less is used (Im not certain what goes on in the Camera when one changes the ISO setting, weather is just pixell binning or something else- does anyone know??) As regards your banding on the EOS350 it must be a problem if it has been brought up on the "Yahoo Forum" by others, It dosent look real bad to me, did you do a DF subtraction in this picture, and does a DF subtraction remove it normally on long (6-10 Min.) exposures, was the Pix. taken as a RAW image, how was it converted to a TIFF (I assume it was), all in all a nice Picture of comet McNaught I wish we could see it, its been cloudy here since the 15th of last month so no chance.

cheers......Jim