I found an interesting site related to ISO and various cameras.
And it all supports what Moosexpert has been saying all along, duh.
Dyanmic range vs ISO and Shadow improvement vs ISO.
explanation:
http://www.photonstophotos.net/GeneralTopics/Sensors_&_Raw/Sensor_Analysis_Primer/Photographic_Dynamic_Range_Shadow_Improvement.htm
You can pick and choose cameras to see their chart here for the "Photographic
Dynamic Range Shadow Improvement versus ISO Setting":
http://photonstophotos.net/Charts/PDR_Shadow.htm
All the charts are available from here:
http://photonstophotos.net/
such as dynamic range vs ISO
http://photonstophotos.net/Charts/PDR.htm
Which almost always drops ~1EV per +1EV increase in ISO.
example of shadow vs ISO with GX85 and GX9
http://photonstophotos.net/Charts/PDR_Shadow.htm#Panasonic%20Lumix%20DC-GX9,Panasonic%20Lumix%20DMC-GX85
What this shows, for example with the GX9, is that there is only a small Dark
improvement with higher ISO, but increasing the ISO looses dynamic range. Hence
setting lower ISO and adjust exposure in post gives the most dynamic range
without sacrificing the shadows too much - as Moose has been saying.
However, if one does not need the full dynamic range, there can be some
improvement in shadows with higher ISO. So setting the highest ISO without
clipping highlights is the optimal point for a given scene.
{FF-rant: Comparing a dynamic range of FF sensor to u43, for example, a7r3 (or
a73) is 11.64 at ISO 100 compared to GX9 is 9.75 at ISO 100, almost 2 stops.}
I found these links from this topic:
https://www.fredmiranda.com/forum/topic/1617203
conceding WayneS
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