unreliable detection of the lens during import

[RomanSammer]

Describe the bug

When importing Images to Darktable the lens is detected unreliable.
I imported Images from the same Camera and Lens combination and the same shooting and sometimes the lens (Canon EF-S 18-135mm f/3.5-5.6 IS USM) is detected right and on other images Unknown Lens (36912) is detected.
I also get this effect with other lenses and Cameras.

Steps to reproduce

Import Images.

Expected behavior

darktable should import the exiv information right

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

distro packaging

darktable version

4.6.0

What OS are you using?

Linux

What is the version of your OS?

Opensuse Tumbleweed

Describe your system?

No response

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Nvidia GTX1060Ti

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

[MStraeten]

darktable uses exiv2 library for extracting metadata from image exif data. So better report that there.
For a workaround see https://github.com/darktable-org/darktable/wiki/User's-portal#my-lens-is-wrongly-identified

[RomanSammer]

Thanks!
The workaround works now. Hope the issue is solved in future releases of exiv2.

[ptilopteri]

only if it is reported

[AxelG-DE]

Justnow I am struggling as well with exiv2

I do have a ~/.exiv2 file in place and it did work in the past, but all over sudden the recognition does not work anymore. I do have libexiv2-0.28.1 in place which is the current gentoo's version....

[MStraeten]

there are known issues with canon lens detection in exiv2 0.28 see Exiv2/exiv2#2746

[AxelG-DE]

there are known issues with canon lens detection in exiv2 0.28 see Exiv2/exiv2#2746

thanks for pointing me there, @MStraeten

[AxelG-DE]

@RomanSammer which exiv2 version you are running?