In article ,
newshound says...
Or are you saying that you have a camera without such an adjustment, and
you are trying to demonstrate that it is faulty?

I meant that these two cameras, if set at the same ISO value, aperture
and exposure time should deliver an image with the same brightness
value.
But one of the cameras creates a brighter image, even in RAW (if
applying the same RAW conversion parameters).

In other words either the ISO 100 of one camera is in reality an ISO 80
or an ISO 125 and the other camera is accurate, or both cameras deviate
a bit from the ISO.
--
Alfred Molon

Olympus E-series DSLRs and micro 4/3 forum at
http://tech.groups.yahoo.com/group/MyOlympus/
http://myolympus.org/ photo sharing site