Designing a Sensor

[Godfrey DiGiorgi]

On Nov 1, 2006, at 4:53 AM, Joseph Tainter wrote:

> 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.

Read the information on how sensitivity is calibrated that was posted  
to you on DPReview.com.
And remember that the settings will always be rounded to suit  
sensible, familiar numeric values, just like focal lengths are.

The difference between ISO 76 and ISO 80 is insignificant,  
photographically.

G