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[OM] Re: E-1 ISO 800 Acceptability

Subject: [OM] Re: E-1 ISO 800 Acceptability
From: Wayne S <om4t@xxxxxxxx>
Date: Thu, 09 Mar 2006 09:52:51 -0500
At 09:19 AM 3/9/2006, you wrote:
>How are ISO's simulated on a digital sensor?  Does the ISO setting
>change the threshold signal for the sensor?

I don't know the specifics. My assumption is that the dynamic range
of the sensor, followed by adjustments in the gain prior to the A/D
are set to give performance appropriate for a specified ISO setting.
So for example, at iso 200, some of the dynamic range of the sensor
is sacrificed by adding 2x gain before the A/D converter. Hence
the sensor is operated at a lower S/N ratio, (less light), while the
signal is boosted back up to the range of the A/D converter with gain.

Wayne



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