Originally Posted By: andy
I thought I'd read that the amplification was only turned up when you enable those extended ISO modes that most DSLRs have.


But a quick bit of Googling proves I remembered wrong wink

Changing the ISO settings is basically changing the gain on the amplifier between the sensor and the A-to-D converter.

http://photo.stackexchange.com/questions/2946/how-is-iso-implemented-in-digital-cameras
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