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Good advice, yes shoot raw and if you are new to this I would enable long exposure noise reduction, makes the processing easier till you learn the ropes. Keep away from very high iso`s and shot as many as you can manage and stack these.
Done 2 darks with the 20D and the 40D both 5 min long at 22 degrees iso 800. Shall post a 100% crop of each this arvo. At a quick visual look both look very similar but have heard the 50D is a bit noiser compared to the 40D. That`s why I got the 40D over the 50D.
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