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cheers for the comments
The colimination, I do find tough. I understand it for sure but I am using a orion cheshire and sight tube but find it difficult to tell if the ring binder on the primary is actually in the centre of the crosshair on the cheshire. If you move your eye a little then the crosshair of the cheshire moves or the ring binder moves. So how do you know if your eye is centered in the sight hole? I know its small hole but there is definate room for error.
I nail the sucker in the end but it is a dark art!
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