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You will get diffraction rings by using a bright star, as Sheeny said, but
also high magnification. Also as previously said, the better the seeing the
better the rings. I imagine that you were working at higher mags with
your much longer focal length 11" SCT.
Diff. rings are a function of light, and have nothing to do with the type
of scope.
raymo
Last edited by raymo; 09-02-2014 at 05:08 PM.
Reason: more info
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