Godfrey wrote:

Designers of imaging sensors typically try to maximize sensitivity
while minimizing noise, and there are many physical constants here
that limit deviation from a norm to within a very small range of
values. From most of my friends at Agilent, what the whole thing
boils down to in general is how large the photosite is and how
efficient the microlens is at delivering light energy to the
photosite well

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Curious that the base ISO is usually a round number that photographers 
are comfortable with--50, 100, 160, 200. No sensors at, for example, ISO 
76 or 137. This makes me suspect that a specific base ISO can be 
designed for.

Joe

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