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Dave,
I sometimes get the Newton rings with my double stack SM60 when using the TV Powermates or the AE x4 imagemate.
I find they can vary in intensity with the tuning to Ha. They are also related to the cover plate thickness on the CCD chip itself and the pixel size of the camera...some cameras are worse than others.
The compromise for me is a x2.5 Powermate and the DMK21 camera.
I've just got a DMK41...so it will be interesting to see the results.
My seeing conditions don't really allow me to go much above f30 and f40 on a good day.
Ken
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