[The_bluester (Paul)]

That is more or less my understanding too. “Unity” gain and “Highest dynamic range” in the driver pull down list are the same thing. I believe that gain 0 is about 0.8e/ADU so as close to unity as they go.


Edit to add, I was on my phone before. I hope and expect to use gain 0 in my application to hopefully get the best star colours out of it. I am not actually sure that the gain level will make much difference with respect to dark skies as I have or under light pollution. The only advantage I could see is that the lower read noise would let you overcome the read noise sooner, allowing you to use more but shorter exposures.