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According to the specs the back focus distance is 70 mm, so an additional 10mm spacer might help?
The scope is collminated using a cats eye collinator and checked using a straight laser collminator, I see the point about focal plane. 2 possibilities really, secondary mirror not square, or the coma corrector itself.
Thanks for help happy to hear more, like can you get a 10-15mm t-piece spacer?
Whats the best way to Make sure the secondary is square?
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