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Old 29-09-2009, 04:12 PM
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acropolite (Phil)
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acropolite is offline
Join Date: Feb 2005
Location: Launceston Tasmania
Posts: 8,988
I have the camera away from any power leads, plugged directly to laptop with usb cable.
Try taking your bias frames without the camera connected to the laptop.

Might also be worth checking Canon's site to see if there are any firmware updates, banding has been an issue addressed in firmware for some EOS DSLR's.
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