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Hi Andrew.
I’m in the tilt camp on this one. Where it’s coming from though you’ll have to spend time finding. Mine was in the focuser. F/4s are fussy. It doesn’t take much tilt to have what Stephan said about focus shift across the image. With the weight of an OAG on the small nose of the MPCC I’d be surprised if you could get it to work consistently. Martin is right about the GPU corrector with how much less boated the stars are though it but just as important for you is the length of the corrector. It’s the full length of the draw tube in the focuser making it much easier to centralize and sit true. Depending on how much money you want to spend refining this setup, I’d start with the corrector to help fix the tilt and I’d also heavily advise a focuser upgrade to handle the weight better.
Cheers
Ryan
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