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Ray,
What was your sub length and guiding error ?
It doesn’t look like coma , more tilt or tracking
I had to add a 1mm spacer to my MPCC Mk3 to eliminate coma in the corners ( 8”f5 GSO newt and 6”f6 GSO newt with a 2600MC camera )
So the distance from camera sensor face to CC was 56mm instead of the standard 55mm
Martin
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