Are there physical limits to image quality for a given sensor size?

Started May 5, 2013 | Discussions thread
Eric Fossum
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Re: 2.5+ Stops away from perfect Photon Counting with Color Recording
In reply to Jack Hogan, May 5, 2013

Jack Hogan wrote:

Great Bustard wrote:

An ideal sensor will capture every photon than falls on it and record the color of that photon and introduce no additional noise (keep in mind that noise is an inherent quality of the signal itself -- that is, light is noisy).

FWIW today's best DSC Bayer sensors are about 2.5+ stops away from being able to accurately count the number of incident photons (about 1 stop away)  while recording their Color (about 1.5+ stops away).  For sensors with current CFA technology there is a tradeoff between reducing the latter figure and color discrimination.

Jack

How do you figure this?  First of all, this is about read noise and not QE so the metric seems completely irrelevant.

Second, my calculations give a different result.

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