This time especially the right upper corner is problematic (left upper corner too, but not that much as the right upper corner). At least not all 4 corners are affected in the same way… 
I’m unsure what’s the reason for this… So far, after reading a lot about the topic, I think the problem is:

  • working distance to the corrector not accurate
  • small remaining tilt

Please advise if I’m wrong.

I’m already thinking about a 2″ screw adapter for the MPCC to prevent tilting… 

This is a single sub, 120sec exposure time. It seems the only good corner is the right bottom one…

And by the way, this is a very faint planetary nebula…

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