The Joy of Pixel Density

Started Jul 13, 2008 | Discussions thread
aclo Regular Member • Posts: 480
Re: Shot noise

Tristan Cope wrote:

This is what I was trying to get at with my post.

JPS' post is actually in agreement with the one I made... Can you explain what you had in mind a bit better?

If the photon count
for each individual pixel gets very low, then then signal to noise
ration dramatically falls.

Let say, for example that we have a 40MP 1/1.8 sensor, and that in
certain light conditions the average photon count per pixel is aound
1. Because of the effect of shot noise the signal will be
indistinguishable from the noise. Binning pixels won't help.

The last statement isn't true. Can you explain the thinking that leads to it?

Sufficient photons per pixel are required to statistically
distinguish signal from noise.

This would still be the case even if there was no read noise.

Certainly not (although I do agree it seems like what you say should be true, at first sight).

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