Why bother changing base ISO?

Started Jul 18, 2007 | Discussions thread
cycle61 Senior Member • Posts: 1,550
Re: Why bother changing base ISO?

Jim Kaye wrote:

Yes, but isn't it true that the only way to truly "amplify" the
signal at the source is to use a slower shutter speed or a wider
aperture, and I said at the outset I'm proposing a situation where I
don't want to do that. So no matter where along the way the signal
is amplified, the noise will be amplified, as well.

This is true. However, the diffference will be whether you are amplifying an analog signal, with thousands of levels (by increasing ISO) or a digital one with maybe a few hundred levels (boosting in post)

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