In this answer, @jrista states that even a camera with a perfect, noiseless sensor would still have noise due to "Poisson noise" aka "Photon Shot Noise" - noise caused by the random variations of photons, which cause more photons to enter one sensel than another.
I'm just curious - is this a significant concern for real-world photographers? I would assume that this noise would be so infinitesimally small that we can consider it to be basically 0. Are there any studies that measure how much noise is from shot noise, vs other causes (like electrical or thermal noise from the electronics) ?
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