When opening RAF files from my X-T2 in darktable 2.6.2 on Ubuntu 18.04, photos shot at ISO 400 - 640 are underexposed by about one stop, photos taken at ISO 800 or higher are underexposed by more than two stops.
I took a series of photos with ISO values from 200 to 12800 on my Fujifilm X-T2. The exposure was kept the same by adjusting the shutter speed, all other values (aperture, white balance, …) were unchanged.
When looking at the in-camera JPGs, the exposure stays pretty much the same for all ISO values / shutter speeds:
When importing the raw files into darktable, only the ISO values from 200 - 320 match the exposure of the in-camera JPG. From ISO 400 - ISO 640 all photos are about one stop underexposed, photos with ISO 800 or higher are more than two stops underexposed. To demonstrate the problem I exported the RAW files into JPG with the default settings applied by darktable:
As reference I also provide the RAW files:
Has someone else already experienced this problem?
Thanks a lot,