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Paul,
Nice work. I can vouch for using low ISO particularly I’d you are lucky enough to have dark skies and low light pollution. I have a Cannon 60D and although settings may differ to your Nikon the theory should still apply. I have found ISO 400 is perfect and star colors are much better with more dynamic range as mentioned. The draw back is that you need longer exposures (which you are achieving). Else I increase to ISO 800 which I find is a good balance.
Keep up your good work.
Anthony
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