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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