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That's a corker of an image Peter, even if you did have a few frustrations. I get a bit of "heart shaped stars syndrome" if my guiding is wandering around a bit - the sum of say a 45degree "wander angle" and a roughly horizontal angle. I was thinking I might even do a sequence of shots passing through focus just to check its not focus/collimation related.
It may well be the image scale too that makes it tricky - I think you'd be imaging at around 1 arcsec/pixel too or even a bit less, which is tough considering seeing is often 2-3 arcsecs?
Do you think you'll do some colour sometime? Would love to see that.
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