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Nice one Greg, glad the new cam is working out for you.
There's the age-old SNR trade off with exposure length on these cameras, even with the relatively low read noise. I think if you stay away from extremes and consider your target when selecting exposure lengths you'll do fine.
I built up a dark library with 1, 5, 30, 180 and 300s exposures for the two gain settings I use (53 and 111) and don't deviate from those. I basically only use two... 300s for imaging and 1s for flat darks.
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