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Secondary mirror alignment


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Apart from the MK I eyeball looking thought the focuser is there any  easy way of checking that the secondary is perfectly alaigned with the focuser drawtube.

I suspect that even if you have the mirrors collimated it could be you could still have a misalignment of the secondary.

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  • 4 weeks later...

Rather than being collimated I want to check it is correctly rotated to start with.

Yup - a sheet of white paper (with some Sellotaped-on string for easy retrieval) lightly wedged between secondary and primary. If rotated properly the secondary will present a white circle when peering into the drawtube, if not, it appears as an oval. It's also a good opportunity to check that the circle thus presented is positioned centrally relative to the drawtube.

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