Can you try:

exiv2 -pt IMG_xxxx.cr2 | grep Lens

I got that on an other lens:

Exif.CanonCs.LensType                        Short       1  Canon EF
24-70mm f/4L IS USM
Exif.CanonCs.Lens                            Short       3  24.0 - 70.0 mm
Exif.Canon.LensModel                         Ascii      70  EF24-70mm f/4L
IS USM

Maybe you can try also to update your exiftool-version (I've 10.67 here)

Jean-Luc

2017-12-04 0:29 GMT+01:00 Marc Mascré <li...@mascre.fr>:

> Hi
>
> It seem to be exactly this model for my lens. But when I use exiftool on a
> .CR2 file from my camera, it detect my lens as a canon EF 75-300 too. (see
> file attached)
>
> How can I find the right exit informations ?
>
> Marc
>
>
>
> Le 03/12/2017 à 18:24, Jean-Luc Coulon (f5ibh) a écrit :
>
> Hi,
> What is the exact model of your lens (from the exif)?
> Is it: "Sigma DT 18-300mm f/3.5-6.3 DC Macro" ?
>
> If yes, it is not in version_1 of lensfun database but it is in version_2.
>
> If you upgrade your database with the command "lensfun-update", it will
> create the following in your home directory: .local/share/lensfun/updates/
> version_1/
> And then the lens will be in the file: slr-sigma.xml
>
> Jean-Luc
>
>
> 2017-12-03 18:07 GMT+01:00 Marc Mascré <li...@mascre.fr>:
>
>> Hello
>>
>> I have a lens, the sigma 18-300 f3.5-6.3
>>
>> The problem is, it is detect by darktable as a canon EF 75-300
>>
>> I see the link for raw.pixls.us but it seem to be only for camera, not
>> for lens.
>>
>>
>> How I can tell to darktable that my lens is a sigma 18-300 and not a
>> canon 75-300 ?
>>
>>
>> Thanks
>>
>>
>> Marc
>>
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>
>
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