Thanks Robert. I have taken some RAW's on a few objects but haven't got around to processing and comparing. My next task.
Thanks for the advice Clive. I did take some some recent shots of M16 and M17 - fainter objects - and regret now that I didn't take them in RAW. The fainter detail does look a little blotchy which is hard to remove. So RAW's in future.
Doug, I wonder if the 400D picks up a little more H alpha than the 40D. But I know I'll need a modded camera if I want to do the Horsehead or any H alpha work for that matter. Regards the Hutech modded Canons, with the Canon rebate, the 40D is not much more than the 450D. Have to make up my mind soon. The QHY8 is looking too complicated for me at the moment.
Craig
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