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It will be tricky to reduce an RC while maintaining a fully corrected field for a full frame sensor without spending a fair bit of dosh. I have heard APM is working on a a new reducer for GSO RC's. From current offerings, maybe a large Riccardi at the least, ideally something like Aluna RC reducer, but that would cost probably $5k landed.
With RCs, it might be best to stick to native FL with properly matched pixels. Alternatively, 150-160mm quality refractor combined with 4-6micron pixels should be much easier to run and would most likely still remain seeing limited (not aperture limited) for DSO imaging.
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