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Got some more data - 18 x 4 mins at ISO1600.
It's an improvement - the image I posted is a composite of the two data sets. But it's not as much of an improvement as I would have suspected. I've only just moved into the city from a dark sky location, where ISO1600 was working fine for me. I'm suspecting that the sky glow might be a bit much for ISO1600. I'm getting the sense that 4-8 min subs at ISO800 might be the sweet spot for this camera/mount/location combination for these brighter extended objects.
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