I am using an ASI 120 MM-S and ASIcap (v2.5.6) with SDK driver v3.17.
When trying to change the offset (''brightness'') at constant commanded gain (30), I found the strange following results:
- in MONO16 with any binning (or in MONO8/Binning=1), the true adu mean value are correctly equal to 16 times (resp. 1 time) the value of the offset and the sigma is consistent with your quoted readout noise of 4 e/adu.
- in MONO8 and BINNING=2, the true adu mean value seems to rather obey the equation: ''-2 + 4*brightness''. In addition, the histogram looks like to be 4 times broader than in BINNING=1, while it should be 2 times narrower.
Of course, input signal was the same in each configuration (the obscurity actually).
Can you explain ?