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Allan, your biggest problem with the 20D is noise, but the QHY-8 or any Sony sensored camera doesnt suffer from it, so long exposures do not show any real noise problems, unlike DSLR cameras. If you read and looked at the images from the review of the QHY-8 by Clyve (Alchemy), you can see what differences there are between the 2 exposures.
Theo
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