EM-5 Low ISO, there is a RAW difference

Started Feb 3, 2014 | Discussions thread
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TorsteinH
TorsteinH OP Senior Member • Posts: 1,123
Re: See this discussion for more details

texinwien wrote:

TorsteinH wrote:

There is a RAW difference between ISO 200 and low ISO on the E-M5. At least according to this website http://www.guillermoluijk.com/article/em5isolow/ According to his measurement the RAW file is at ISO 160 whatever that means both theoretically and practically. I would expect a tiny bit cleaner black and the same headroom as ISO 200 if you "underexpose" by 2/3 f/stop.

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Torstein

In short, it seems that LOW ISO on the E-M5 is like ISO 250 underexposed by one stop.

How do you draw that conclusion?

If the RAW is different at camera ISO 200 and camera ISO Low (measured to ISO 160), I would guess that ISO 250 is equal to ISO 200 (If there is no difference at RAW files  between ISO 200 and ISO 250 underexposed 1/3 f/stop).

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Torstein

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