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Old 07-02-2020, 07:23 PM
Martin Pugh
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Martin Pugh is online now
 
Join Date: Nov 2006
Location: Canberra, Australia
Posts: 1,339
Just ran a set of images (with the flats that matched) through PI basic ccd parameters script.

While PI does not output dark current value, the readout noise now correlates with the QHY spec i.e in Photo Mode with a gain of 26, the readout noise by spec is 2.7e and I measured 2.48e and a gain of 0.38.

I then ran another set with darks/bias that did not match the flats and
again the readout noise matches that of the spec at 1.7e and a gain of 0.34.

The downside is that a third set using the Ultra Full Well mode and a gain of 20 (fullwell 69000), PI failed miserably saying the readout noise was 0.3e and the fullwell was 2300K.

So who knows. I dont think I like these CMOS cameras...too much room for error and you seemingly have to go to extraordinary lengths just to identify a usable set of parameters and to calibrate an image.
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