Quote:
Originally Posted by gvanhau
I run this scritp and got these results.
I can see that bias has almost not changed, but dark...
Note that darks are 1800 sec exposures
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The read noise is about where you'd expect at 10 to 11e- (gain is probably somewhere between 0.4 and 0.45) but the noise in the new dark is much worse. If long subs consistently show that behaviour then that would certainly explain why you need more subs now.
The degradation of individual pixels over time due to cosmic rays is well known but I wasn't aware of aging affecting dark current/noise that badly. I wonder if the sensor isn't getting cooled correctly now?
Cheers,
Rick.