Awesome shot! Good to see other DSLR images around here. I think some chroma NR could be a benefit in the darker areas without to much loss in star colour, details, etc. Luminosity masks in PS would nail it! - hit the darker areas and leave the rest as is. Luma noise already well controlled already.
Are you using an external encased peltier or one attached to a cold finger as a part of a DSLR mod? Just recently built a case for my 6D. So far, so good (down to 6deg with 18 ambient), but I do have that fear of condensation.
Once again - really cool image!
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