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How to accurately align 2 scopes on an SBS plate?
I have an All-ADM Losmandy style Side By Side mount on my EQ6. It normally holds a C8 on the LHS and a refractor (prev. ED100, now ED80) on the RHS.
I have never been able to get both scopes aligned so they are both centred exactly at the same star. I use a DSI/QHY8 CCD on the C8 and a 25mm 2" EP on the refractor(s) while trying to align them. I centre the star on the CCD then, when looking in the refractor EP, it's always visible but normally well off centre. As the 700/1000mm refractors have a much wider field of view than the C8, I would expect to see the star plumb in the middle of the EP.
I've checked all mechanical alignments and tightened all the saddles within an inch of their life, but to no avail.
I am thinking of using brass shim, but it sure seems a clunky approach, so thought I'd ask and see if any other SBS users have had the same problem and how they fixed it.
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