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The plain Orion Flattener (not reducer) is the best I've bought and tested. I've also tried Televue TRF2008, William Optics FF4, Meade 6.3 SCT reducer, MPCC, and more on my ED80 with Canon EOS DSLRs and my QSI583ws. And it was the cheapest. Second best was tie between WO FF4 and TV TRF2008.
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