Is the E-M5 sensor response nonlinear?

Started Jul 10, 2012 | Discussions thread
Steen Bay
Veteran MemberPosts: 6,188
Re: A word of advice.
In reply to Iliah Borg, Jul 17, 2012

Iliah Borg wrote:

But if looking at the 'SNR' ( or 'G2dev') values in column 2, then I don't see any tendency to a lower increase in the highlights than in the midtones.

You can see it does not fit the model. Please re-read on photon noise, its dominance in midtones and highlights, Poisson distribution, and, say, methods used to determine unity gain, as those methods explain the ratio of the signal to sigma^2.

Yes, I misunderstood. I know how the shot/photon and the read noise are supposed to behave, but I'm not familiar with measuring std dev and analysing raw files. I assumed (reasonably, I think) that the "SNR values" you were referring to actually were in the chart.

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