Quote:
Originally Posted by The_bluester
Depending on what camera you are using you may be able to calibrate flats with a master bias instead. My older camera (ZWO ASI294MC Pro) you could not do that, but my current pair (A ZZWO ASI2600MC Pro and 2600MM Pro) produce useful bias frames so I calibrafe the flats with a master bias. It hugely simplifies creating good master flats.
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I had a brief chat with Adam Block about that and it seems it may not be so simple. i.e. it’s not a matter of which model of sensors have a stable bias and which don’t. Even within the same sensor model, one unit may have a stable bias whilst another unit from the same model may not.
According to my understanding the bias of one sensor unit should be assessed over time & if that particular sensor unit demonstrates to have a stable bias over that time period, then one could use the master bias approach.
However if one is uncertain a particular sensor unit has a stable bias or not, then the safer approach is just to use flat darks.
That’s my understanding anyway.