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Hi Patrick,
>> So the readout noise is more a quantization noise.
>
> I believe some of it may be.
If it doesnt decrease with another board, you have to rethink the
way you gain the data.
I dont know how the darklevel of each pixel is sampled in a cmos
sensor. But in my understanding, it has to be sampled just close
bevor the lightlevel, or has to be integrated for a longer time
to get rid of the low frequencies of the amp-noise.
> That drawing IS good. It is quite similar to what I see. So, it looks
> like I just never reach the shot-noise region.
Yes, but in the case that the read-noise increases with a longer
exposure time (and the brighter images were captured with longer
exposures), it would maybe pointing to a wrong darklevel acquisition.
>> I dont know how much saturation can flatten the slope, but 0.2?
>>
>
> I would expect the characteristic steep fall off of the curve at
> saturation.
Yes, if the converter is saturating bevor the sensor gets close
to the fullwell.
Otherwise it shouldnt fall off so quick, dependend on the sensors
characteristic. Ok, 760e noise_rms is nothing against 500ke fullwell,
so it wouldnt flatten the curve a lot, too.
Best regards,
Jens
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