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Bug #12683

Fujifilm X-T2: Exposure dependent on ISO setting

Added by Christoph Schmidt 5 months ago. Updated 2 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
Darkroom
Target version:
-
Start date:
06/06/2019
Due date:
% Done:

0%

Estimated time:
Affected Version:
git stable branch
System:
Ubuntu
bitness:
64-bit
hardware architecture:
amd64/x86

Description

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:

https://drive.google.com/open?id=1qH9VD9m4070njc7Twpkvl16lkLv0StXK

When importing the raw files into darktable 2.6.2, 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:

https://drive.google.com/open?id=14Kl4jRepfRGMI1UkA1g6ODiU9Va39Ffo

As reference I also provide the RAW files:

https://drive.google.com/open?id=1CeC5fHZuuvzhgcv60KyifEJpZWFusvgw

Please note that I use darktable 2.6.2, but this version is not available in the "Affected Version" drop-down box.

History

#1 Updated by Christoph Schmidt 5 months ago

This may be the same issue as #12616.

#2 Updated by Christoph Schmidt 2 months ago

In case someone has the same problem: Darktable seems to have an issue with the DR setting. When DR is set to 100 everything is fine, photos at all ISOs are exposed correctly. At DR 200 or DR 800 you will get underexposed photos at ISO 400 and above.

Also available in: Atom PDF

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