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Some very nice detail on the 2nd image Mark.
Yes, the wider the bandwidth, the bigger the stars get due to broadband skyglow, street lighting etc. Ha will often do as lum on its own, and you can do Ha at anytime, save it for when the moons up.
6 mins is too short for Ha, go 15 or 20mins even, stars shouldnt saturate with Ha.
You can squash RGB stars in PS so they are the same size as the Ha stars, to aviod fringing.
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