Ahh - interesting. It is almost as if extended full well mode is "super low conversion gain" mode.

I played around with EFW a bit last night, though without the benefit of your sensor analysis. I had set HCG + EFW and gain 100. With an f/6.5 scope on the Double Cluster, I tried various exposure times, up to 120s. At 120s I still had not saturated any pixels (max ADU ~58000). Of course I have no idea what the e/ADU is for the HCG/EFW combination.

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