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I guess the only way I'll find out is to measure it to know.
When you say bias drift how did you measure it? Did you wait for 20mins for the camera to settle down after it reached its cooling temp?
Did it vary with the ambient temp falling as the evening progressed?
Richard also says bias will be different at the start and at the end of a read out process. So there is a variable there as well. I don't know how you measure that if you can at all.
Greg.
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