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Thanks for all the help. Decided to just attack the problem one step at a time. Collimate by eye with just an eyepeice, then add reducer and focuser while confirming collimation hadn't altered significantly.
Then removed everything and attached cam without any accessories and confirmed that collimation was in ball park then progressively added bits, reducer, focuser and then OAG and filter wheel. Once done I did a very careful collimation and it appears to have fixed the issue.
My guess is I made an error in my spcing but cannot for the life of me see what it was!!
Cheers
Malcolm
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