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I would stick with the 8300 on the FSQ.... it is a very good match. Anything smaller is a waste of FOV for that scope.
Regarding the RC12, don't bother using the 8300. At least not at native focal length. I have been imaging at 2541mm, 0.44" sampling, with 1.3-2" FWHM most nights and it still doesn't match well. Anything above fwhm 2" is unusable and has to be rejected due to washiness/smearing. AO will not solve this if that's what you're hoping to counter it.
I have a PL16803 coming some time in the next 8 weeks, which will hopefully be a more suitable match. If you're using a reducer, still consider something with at least 7micron pixels. The 8300 is very well suited to the FSQ, don't expect to bin 2x2 on the RC12, it won't work and you'll overwhelm the horizontal shift register quite quickly with that much aperture
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