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Yes Andrew. And I'm converting to Tiff files in the Canon software before stacking. But I will try the CWB. I might need to start using flats as well.
You're right Doug. I hadn't noticed that before. Wonder where its come from? Some detective work needed.
Thanks Alex and Matty. Matty, I've taken quite a lot of different exposures of the Helix now at 400, 800 and 1600ISO. I can post a comparison between the different ISO's if you're interested.
Craig
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