Thanks guys, appreciated.
I was interested in the surface/ prom imaging capabilities.
The ASI 1600 is supposed to be a full 12 bit camera
https://astronomy-imaging-camera.com/product/asi1600mm
The full well obviously depends on the gain setting. Mostly I work at unity gain (139). It was interesting to see that both the surface brightness and the faint proms were recorded so well.
Onwards and Upwards.