> I do have questions, is there a theoretical limit to pixel
> count/image depth/capture rate using known physics?
> How does it compare to the theoretical limit for film, on a
> straight square inch to square inch scale, using as close to
> comparable parameters as possible?
Yes, there is a limit.
Pixel count, and film resolution, are both limited by the same
factor - the wavelength of the light being recorded. You can't
have discrete sensors separated by distances smaller than the
wavelength of the light. That puts a lower bound on the size
of a pixel, and similarly the size of film grain.
Image depth and capture rate (or density ratio and film speed) are
interrelated. Again, the theoretical limit is physically based;
you can't have a sensor that measures in units smaller than a
single photon.
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