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I have only used this camera at unity gain = 94.
Temperature = -5C. I don't see any point in going lower with this camera
Exposure length = 120sec - my scopes are F4 and F5. I sometime go even lower - 90sec.
At unity gain, 90-120sec subs are swamping read noise heaps and I'm not getting too much star saturation. Accordings to Shiraz's spreadsheet 60 - 120sec is about optimal for this.
So I figure you might be working at too high gain and too long for exposures
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