I’ve used a D810 on my refractor on a couple of occasions and the correction at the edge of field is very good but not perfect. Going from OSC to mono makes it appear a bit worse.
I’ve noticed this with using my D7200 and QHY163 on the same lens (Sigma Art 85mm F/1.4). The D7200 @F/2.8 looked better than the QHY163 @F/3.2. The QHY163 has slightly smaller pixels at 3.8 vs 3.91 microns but it is also a smaller chip being a Micro 4/3 as opposed to an APS-C.
One of the reasons that the KAF-16803 is “easy” to correct for is the 9 micron pixels. Any telescope that shows even almost round stars with a KAF-16803 will show a reasonable amount of distortion with a QHY367M.
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