Thread: Squashed stars
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Old 22-09-2020, 09:49 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Hinchinbrook
Posts: 19,852
To me it looks like a combination of things.

1_ you're slightly out of focus so there's a hint of trefoil even on-axis. Maybe pinched optics.

2_ slight elongation in RA so guiding/tracking is not optimal even for 60s.

3_ a bit of field curvature so a corrector spacing needs to be tweaked.

But in all don't beat yourself up. It's still a very good field at that FL. Those are minor defects that can be fixed.
I wouldn't touch the collimation. The field is already symetrical.
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