I have already pointed to the camconst.json file of RawTherapee.applecider said:And shouldn't the actual iso be noted in some exif if it is being changed under the hood? And finally the newest body that I saw listed in the referenced article was the 5d, just seemed odd. Granted it was 2010 would current bodies handle iso in the same way one would want to know. That is change to a higher effective iso as apertures get larger, and were in body lens corrections on and available then?
That unfortunately does not include the original 5D, but for newer Canon cameras (also 5D4), it can be concluded that the values in the raw file are silently multiplied by a global constant correction factor (<1.2).
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