The HDR method is really working well for you Bert. Really enjoy the nebulosity tones throughout the entire frame. My only comment is around the star colours. The process seems to alter the colour balance of them. Looking at the image in PS and using the colour range tool to select only the stars, then selectively remove stars mixed in nebulosity, you'll note the colour shift results in pink tones (first image). The histograms per channel indicate this as there is as a lack of green. By using curves on the green channel only, you can restore some of the balance (second image). Alternatively you could decrease the blue and red channel, but this maybe at the expense of nebulosity (if not masked). Overall, the level of detail you've obtained is impressive. Look forward to seeing more. Have you documented this process as yet? I feel sure others are keen to hear of your experience as you perfect the process. Job well done.
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