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At the risk of a curve ball....
That 0.8-0.85x reducer is about $US 249 = $AU 351.
For around two times that price or below, say $600 to $700 (if you're a good wheeler-dealer) you could have a used Canon 6D fullframe camera, which would yield a far cleaner image and give you a much wider field of view. It would be the equivalent of 1/1.6 ~= 0.625x reducer AND you will not have added any additional optics in to the optical path, which can degrade contrast and add abberations.
Best
JA
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