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I agree with everything except the flattener statement.
I found when using a QSI583 on an RC8 there was still visible field curvature. That was nearly 6 years ago. I confess to being pedantic to star shapes though. The RC8 responds well to the Tak 2.7" flattener. It corrects the field nearly perfectly.
I am still investigating a flattener for the RC12 as the 3" one from Telescope Services does not work. It is sitting on my scope right now but it does not correct the field on a 11002 sensor. I have to crop the field to get a half decent field. I might as well have bought a 6303E.
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