For starters does the 10D have noise reduction under the advanced option or setting..if so select this..what it will do will double your exposure time for every image taken..meaning if you take 1 minute exposure it will take 2 minutes to finish the image as it is taking the dark frame immediately after the exposure.
In the long run you are far better off taking multiple dark frame and combining them to make a master then subtracting these from the image but that takes a lot more time initially and experience with software.
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