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Hi Greg,
I agree that in case of QSI690 losing 65535-64000=1535 ADU is nothing to really speak of. In particular that the sensor becomes non-linear as pixels approach saturation.
My censor does not have any lines, and from my experience bias frames are independent of CCD temperature below zero Celsius, not sure whether hot/cold pixels are affected by sensor's temperature below zero Celsius neither.
Have no idea how easy it is to use the OAG - my model does not have it. I believe Rick has experience is using 683 WSG model that has an OAG integrated into the camera.
Fans are very quiet and smooth, can hardly hear them, in particular when the cooler is working at or below 80% of power.
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