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Jase,
Thanks for that plan. I can see why one should calibrate before using the pix map!
I made a new bias master with 200 subs. When I use it as a Dark + new flat frames (at ca 19,000 adu) I do get a good result but take a big hit in s/n. The new FF will not work alone and actually makes the dust crud even more visible. I must use a bias or dark, or both to get a usable result.
Interestingly using the bias + Flat I do not get a negative number for the min value. But if I use the dark frame the min =-13000. Also, CCDStack scales the dark to 95% even though it is a 12 min dark and a 12 min light both at -15 cent. I would have though the bias would not be used in that situation even though it was loaded in the calibration tool.
I ran the numbers on my camera and got Gain: .322221447, Read Noise: 5.0148677799. I tried to read about how to measure/perform the PTC. I immediately felt dizzy (and stupid).
Peter
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