>>3254485>I'll do the test again with half and third stops between 800 and 1600 isopic related
Top images are from yesterday, bottom from today. The histograms are slightly different because the lighting had changed a little.
So, up to 1600 iso there is an increase with each iso setting. I think for low light I'll use 1600 from now on, or at least be aware of this. A few tests shots and looking back at some old files shows that careful editind of under exposed raw files is much better then cranking the iso up, especially for highlights.
I know this is old news to many but the RawTherapee "bug" took a lot of the guess work out of it.