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Old 04-09-2012, 03:52 PM
saysme (Steve)
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saysme is offline
 
Join Date: May 2012
Location: Newcastle Australia
Posts: 63
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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