Nice Andrew! Real nice!
I would have thought that stacking the images from the two different cameras would have been detrimental to the overall image, as it would have sorted out the median or average of the pixels, and the shots from the 20Da would have been quite a bit brighter (I imagine) than the standard 20D due to the different filter... I would have thought that the 20Da shots would have contained a lot more nebulosity than the 20D shots, and hence, when stacked, the nebulous extension would have been half way between the two... That being said, I could be (and it seems I am) very wrong, as your image has turned out great!
Nice work buddy.
Alex.
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