Quote:
Originally Posted by gregbradley
I think he was referring to the readout process from the reading at the beginning of a single image to the end of that single image.
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Yes, that's what I thought he meant. He's expecting to see a variation in average bias between the first rows and the last rows due to the time delta between when they are read out, presumably due to accumulating a little extra dark current. I can check that by measuring different sections of the bias frames.
Quote:
Originally Posted by gregbradley
Also to falling temps as the evening progresses.
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He's suggesting that some of the bias drift may be due to thermal effects in the external support circuitry which is not kept at a constant temp like the sensor. I agree that's quite plausible but I haven't tried to test it. It would be interesting to know what causes the bias drift but my first priority was figuring out how to compensate for it.
Cheers,
Rick.