Thanks for the reply Paul. Im using a compression ring to secure eyepiece/camera. I had a play tonight before the clouds set in, and got really nice concentric rings. Screwed the Tak scope in, and the centre spot was way off. One thing I'm considering is that the centre spot on the secondary may not be exactly centred?
A good star test would surly be more trustworthy than a collimation tool?
I'll see what I have to screw in an eyepiece/camera and try that and see if it makes a difference.
Thanks.
Erik
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