This is the SkyWatcher Equinox 80 pro apo (500mm focallength)
It has the skywatcher field flattener, that I do not like. I'm not sure if I have issues on how it's mounted, but my corner stars are not round.
Initially I was using it with my diy modded eos 550 dslr, and I was thinking that I might have mounted the sensor slanted. But its the same with this camera.
Stars on the upper and lower left point towards the center, while the right stars point towards the middle height-wise, but straight up and down. Think this can be an issue with the FF autocentering connection.

Camera is ASI ZWO 1600mm-cool
Also Mount is Celestron AVX.

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