Nice work Robin. I find the 2nd version oversharpened myself but that's my taste. I prefer the stars to have a soft halo. Otherwise its a pleasing image.
I'd also try 20 minute subs. 10 minutes is a bit short for narrowband unless you are getting tracking issues with longer subs. You've got to get the signal high enough over the noise floor to get the fainter parts.
John Gleason is the best in the business for Ha and I notice he uses 40minute 1x1 subs at F5. You need stable weather for 40 minute subs. I may even try that myself tonight and see how it looks.
Greg.
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