xsnrg wrote: There is a lot of information out there about capturing flats. It really depends on the camera. You want a good signal, but do not want to saturate pixels. My 1600s are not true 16 bit cameras, so do not have full 65535 well depth available. Even though they call them 16 bit, they are actually 14 bit with bit shifting, so this affects maximum ADU.
Here is one such thread about flats: www.cloudynights.com/topic/579728-flat-f...the-ideal-adu-value/
I have set my ADUs for flats for the ASI1600MM to 23,000 +/- 2000 ADUs.
The tolerance is really not that critical, as long as you are in the linear range and do not clip at either end.
As Jasem wrote, 20,000 - 25,000 is a good range also for the ASI1600.
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