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Thanks Brendan for your reply, I was wondering what to do with those secondary spikes.
The only collimation tool I have is a cheshire, and I collimate every time I use the scope just before dusk. Then later I use a 6.3mm eyepiece and check on a de-focussed star and make sure all the circles are concentric.
It usually looks OK to me, however I suspect something must be moving, because I have to re-adjust every time I carry the OTA out.
Needs further investigating and I need more practise.
Thanks
Bill
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