ISO 100, OMD-EM1II and firmware 3.0?

Started 2 months ago | Questions thread
bobn2
bobn2 Forum Pro • Posts: 61,687
Re: Meaning of base vs. extended ISO
3

Chris Noble wrote:

Architeuthis wrote:

I have installed firmware 3.0 on my OMD-EM1II.

I wonder, whether the new ISO 100 brings better dynamic range, less noise and better colors compared to the base ISO 200, when used for raw files?

Already in earlier firmware versions ISO 64 was available, but as far as I understand it, this does not improve DR, noise or color, but is useful only when too much light is present, to maintain wide aperture and increase exposure time...

Wolfgang

Base is the lowest analog gain before A/D conversion. It's the lowest noise setting.

Extended (top and bottom of the range) is digital manipulation. No SNR improvement. And only useful for shooting JPEGs.

These definitions do not always work. In any case, what you're calling 'base' is not the lowest noise setting. It's generally the highest noise setting so far as electronic noise goes. So far as the shot noise goes, any increase in exposure will lower it, so the  (so called 'extended') settings below will give less noise.

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263, look deader.

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