Paul
Yes it would be nice to combine the best from our images but we image at vastly different image scales
My 6” f6 with the 600D is 0.98 arc sec / pixel ( slightly oversampled )
Your WO Star 71 with 550D is 2.55 arc sec / pixel (under sampled )
I don’t know if you “Drizzle” in your processing which should improve your SNR and star pixel density for better resolution and colour ?
Cheers
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