Re:Newtonian Collimation

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Posted by Andrea Tasselli at 15:09 on 2010 Sep 07

I shan’t think you should worry. It means, if I understand correctly what you’re saying, that the secondary position isn’t corrected for the required offset. In other words the optical axis is slightly offset from the mechanical center of the focuser. OTOH, if you don’t see the airy disc ever then things are not quite OK. I would check with a star test whether you’re collimated or not. If it is, and the scope has been given proper time to cool off and the seeing is quite ok you should be able to see the airy disc of a bright star.Andrea T.