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Quite a nice Helix there. I would have expected a bit more from 18 hours though. Did you use any 2x2 or was it all 1x1? On your 14.5 2x2 may make more sense as 9 microns is the better match for your optics. Then again the broader Ha wings are further out in the FOV.
An unusual colour scheme for bicolour. Usually it would look different than that but its all fair in narrowband.
As Mike said the biggest gain would be to add some brief short exposure RGB stars to the image.
A massive improvement over the earlier version.
Greg.
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