The base ISO setting is usually where you get the most of DR
Lower settings might be useful in some very specific cases (if you really want
a longer exposure so that you can shoot wide open for instance)
I saw some dxo (?) charts a couple of months ago but would be in trouble if you
asked me to point you to them
Happy season Mike and Marnie
Amities
Philippe & Alice
> Le 20 déc. 2019 à 22:56, Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
> a écrit :
>
> Apparently how raw files are dealt with in the low extended ISO range is
> very cam/Mfr specific.
>
> Found this comment with no back up proof:
>
> "The question is just, whether the raw file is affected by the extended ISO
> setting or only the JPEG is. In other posts/articles, not referenced here, I
> saw that indeed the raw file can be affected by extended settings, but not
> always. The way depends on the camera model and manufacturer. In the case of
> EM1-II people are saying that the digital information is processed towards
> highlight clipping, improving S/N in less bright pixels (dynamic range at the
> cost of S/N). So extended ISO remains useful for people that work with JPEGs
> out of the camera, but not the ones who postprocess raw files...
>
> For my needs I must conclude the extended ISO 64 and 100 are useless."
>
> "People are saying" is not five-sigma proof, but seems to be what is out
> there.
>
> Will tell Marnie ot use current base ISO and expose properly for now, Mike
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