Hi all, this is my first post about siril.
I followed the instructions given here Siril - Synthetic biases to find the offset value in ADU for my Nikon D850.
Hi @Frwaf_bfds ,
I think you have applied the method in the tutorial correctly. First time I see an offset level for a DSLR not being this power-of-2 thing but your data seems very consistent over the ISO range. So I guess 400 is the right value for your Nikon.
We may change the wording in the tutorial to say something like:
“which makes sense as it is quite often a power of 2”
Would that make more sense? The point of the sentence was to say that when you get smthg like 2047 or 528, then it’s probably 2048 or 526 you are after. But indeed, in your case, there is no power of 2 anywhere near 
C.
I happen to not see a power of 2 with my camera (ZWO) when white balance is enabled. The green pixels have the correct bias value as a power of two, but not the red and blue. Maybe you can verify with a green extraction (menu image processing → extraction → split CFA channels → extract green), that it’s not the case with a Nikon too?
Hi, thanks all for the feedback.
I extracted the colour channels as suggested, and all 3 give an offset value of 400. I think I’ll stick with that for now and see how it goes.
