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Thanks Elliott, Ray, Glenn, Doppler and Chris for your info. Looks like I will try the thin OAG from Orion. I saw there was a couple of TS OAGs . One was a 9mm and one attached directly to a DSLR. Has any one tried these. Also any suggestions for a coma corrector for sky watcher 250 F4 reflector. Cheers,Rob.
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