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Alistair,
how did you end up. Did you get the rings?
I seem to be having problems getting the rings as well. Racking the focuser back and forward I get a "bigger" star, but I don't get any rings on either a 12" or 16" dob. Doing the same on an 11" SCT and I do get the rings.
So does either magnification or telescope type have a bearing on the result here?
Paul
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