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No worries alpal. I understand there needs to be offset. Im just saying if you use a sight tube and collimate as normal procedure this will happen as a matter of course. If you look at astrobaby's newtonion collimation page at the bottom this is demonstrated in picture and explainer of offset you will see in fast newt. I see this in my f5 newt and my star tests good. When I look through sight tube at secondary I see all mirror clips so must be getting whole light cone. Hope I make sense and if I'm wrong I apologize.
Cheers Richard
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