Why bother changing base ISO?

Started Jul 18, 2007 | Discussions thread
OP Jim Kaye Senior Member • Posts: 2,791
Re: To the Left to the Right

I'm with the OP on not losing a shot. However, I think the theory can
be carried to an extreme, and that may be what's happening here.

Yes, perhaps I was being a bit too provocative in my original post. But I was interested in what some of the people who know more about the theory and the hardware/firmware/sortware than I do would say in response.

The link somebody posted above is fascinating and very informative
with regards to this.
http://www.clarkvision.com/imagedetail/digital.sensor.performance.summary/
It indicates, after thorough analysis, that for the D200 at ISO 800 a
single electron is equal to one step of 4096 on a 12 bit scale. This
means that if you have to go above ISO 800 to expose to the right,
you have more tonal levels available in digital than you have
electrons, so amplifying the signal any more prior to conversion
won't help. I still think that up to 800, you're going to be better
off with analog amplification to achieve your full tonal range. I've
tried some test shots, but I don't have them all processed yet.

Thanks for that clear explanation of what I think is the concept of "unity gain," Nick.
--
Jim Kaye

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