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Allan says...If you levels in photoshop you can get rid of most the pollution. Set the black point and set the white point on a G star if there is one in the shot.
Looks like we've both spent time targeting (and freezing) the same subject from our respective backgardens. How much processing have you done to yours as there is no apparent light pollution or background noise? I have the problem that with M57 being towards the east, the light pollution from Hull is pretty intense. Things should improve as Lyra tracks towards the zenith over the next couple of months.