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Hi, Chris,
Your work is seriously improving. That's one tasty chook. (We've had to hide it from Holly, Molly, Polly, and Boris the rooster, so they don't get upset.)
The little blue circle: You've rediscovered a planetary nebula. Well done!
Suggestions: If by a miracle the sky cleared, we'd suggest a night of just SII only, so that you could balance the colours a bit more and get a bit more red into the image without it getting gritty. The image is already so promising that more exposure on all the channels, but especially SII would be time well spent.
Only 15% vignetting! Oh to be so lucky. On our 2" filters, we're down 30% in the corners on a much smaller FOV.
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