I suggest that you take a single longish exposure, say 60-90 secs
at high ISO, say 6400; disregard noise, trailing etc: A look at the
camera screen will give you a good idea of what the colours should look like,[not the intensity, of course], when the subs are stacked. The
colours in the single subs that I posted recently are exactly the same
as in the final stacked result.
raymo
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