Nice Jerome, as you know i have been working on NGC 6188 as well (it is in my Astrobin gallery top row right side in mono Ha). To me your image seems a bit dark and i think it would benefit from using Ha as a luminance layer. That way you might be able to catch more of the light streaming out from behind the cloud wall. Just a suggestion, but it is still very nice. Whoops, on the other hand, did you use Ha for luminance or a luminance filter?
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