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Paul, for Lum/Ha data I wouldnt worry about saving the stars from saturation, worry about that in your RGB frames.. worst comes to worst take a series of 3 or 4 minute shots just for preserving star colours then selectively mask them if in you need to...
Lum and/or Ha should be purely as much data as you can get in order to give the target brightness and detail.. preserving star colours is another matter all together.
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