I took some raw (CR2) photos and want to edit them in darktable. The focal length is quite low and the distortion high.
Usually I correct the distortion by using darktable's
lens correction module which automatically chooses the right values based on the exif information. It works for DSLRs but for this very camera the values are not known.
- What's the way to correct the distortion in darktable, if I cannot choose the right objective from the drop down menu in the lens correction module?
- How do I determine the values? Which values should I choose?