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Yeah that's right. -30C is a good temp for year round so you only have one set of dark libraries. Modern chips are clean at -30. If not it'd be the support electronics not the sensor. I don't really see a gain at -40 and have also used that at times on an 8300 chip. It usually is clean at -15C.
If you were using RBI control you want the lowest reliable temp as the IR flush causes noise to leak out during the exposure and lower cooling reduces that effect. -35C should be plenty though.
Have you seen a need for RBI on the 6303 Fred? I believe it may be one of the chips that may need it sometimes.
I have only seen RBI a few times on the 16803 - when bright plane lights intersected an image and then the next 2 subs showed a faint line in the same spot that faded out after 2 or 3 subs.
Low temps like -35C make those vertical lines fade out as well. So that's quite an advantage to be able to achieve those low temps.
Greg.
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