Trevor is right there Peter... Blending 10min and 5min subs is no good for a target like this... shoot 10~15min subs all night.. Out at your place, 20min subs are unaffected by light pollution, I'd get your guiding sorted so its all super tight then shoot the longest subs possible on a target like this...
Its a good effort, and the increased resolution of the 8" should really give you a pleasing result...
Alex.
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