[filmscanners] RE: Newish Digital Tech

["Robert Meier" <filmscanner@meierlim.com>]

>-----Original Message-----
>From: filmscanners_owner@halftone.co.uk
>> If you double the number of photons
>> that you capture, the random variations only increase by the
>> square root of
>> two, improving the signal-to-noise by 3db.
>
>Hum.  Do you have a source for that?  I don’t believe that is
>true, and will
>have to think about your assertion.  What is the source of the “random
>variations”?  I know there is some randomness in reception of photons,
>simply because of atmospheric dispersion, and other causes...

I think he is talking about the quantum noise which is introduced due to the
Poisson probability distribution of the Photons hitting the detector. The
resulting error in the signal is proportional to sqrt(2).

Rob

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