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Saturation Capacity and ADU

Photography Asked by B. Erickson on December 25, 2020

I’m having similar issues understanding the relationship between full well capacity and gain as shown in this question here: Reconciling gain (e/ADU), full well capacity and ADC bit depth

The difference here is that rather than having ‘extra electrons’ being accumulated after saturation, I seem to have more gray levels available.

My camera is a FLIR Blackfly 200S6M, the EMVA 1288 performance is found here: http://softwareservices.flir.com/BFS-U3-200S6/latest/EMVA/EMVA.html

According to the specs, the system gain is 0.24 (e^-/ADU). Given the 12-bit ADC, I calculate that it takes 17,062.5 electrons to reach full well.

The listed saturation capacity in electrons, however, is listed at 14,837, quite a bit fewer than ADC saturation.

Am I overlooking something?

One Answer

The datasheet states that the sensor has a DR capability of 11.93bit which is less than the 12bit accuracy/capability of the ADC. I.e. it is not using all of that 12bit conversion, but 12bit is required. And it will be stuck into a file format that can accept 16bit because that is also required; but it will still be 11.93bit (max).

Answered by Steven Kersting on December 25, 2020

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