Thanks guys.
I've trolled through Astrobin and found very few Astronomik/ASI1600 combinatinations, none of which show rings. Many more Astrodon/ASI1600 combinations, also none of which show rings. Astrodon is probably too expensive but Astronomik looks like a good alternative. Not sure I'd risk the new ZWO ones, just in case...
By the way Lee, very nice Trifid. Certainly deserved IOTD!
Kevin
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