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Hi Glen, no I do not - yet. But having just had a look at the ccd inspector result it would seem I have got a tilt problem and the ring is the best way to get rid of that I believe. If I am reading this chart right my collimation is off a little but my ccd is a good way off orthogonal to the light path so the first thing to fix is the tilt...
Thanks for the advice!
John
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