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Tony when I imaged this target earlier in the year I went with 4 minute exposures and got them to total 41 minutes. I had to get my polar alignment pretty good though as I did not have a guide scope at that stage. Also I suggest a lower ISO around 600. You will get great images with any subs totalling more than 30 minutes. To create flats you need to make a light box and as far as dark frames are concerned I just use the noise reduction system in the camera and find that this is nearly as good as creating darks during the night. I am not certain whether the 20D has NR reduction in camera.
Anyway mate, you are doing really well with your images and I suggest that you use that camera also for terrestrial shots. It is a fine camera and capable of much more.
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