As Cam says, The longer you can go on Rho the better.
I shot Rho from a very dark site recently, did 5 min unguided at f4 and iso 1600 but I wish I had taken them at 800 for 15 mins guided.
Very rough process attached, I went a bit soft on the saturation.
I'm going to revisit this one next season, eventually I'll be happy with it.
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