[Digikam-devel] Re: Unrecognised lens Tokina 10-17/3.5-4.5 DX

[Gilles Caulier]

2011/4/17 Milan Knížek <knizek.confy at volny.cz>:
> Hello,
>
> I use a fishey Tokina 10-17 / 3.5 - 4.5 DX on Canon 5D MII and the
> lense is incorrectly recognised by showfoto as Canon EF 20-35mm
> f/3.5-4.5 USM.
>
> exiv2 0.21.1-1 shows
> $ exiv2 -pt 2_04.cr2  | grep -i lens
> Exif.CanonCs.LensType Short     1  Canon EF 20-35mm f/3.5-4.5 USM
> Exif.CanonCs.Lens     Short     3  10.0 - 17.0 mm
> Exif.Canon.LensModel  Ascii    70  10-17mm
>
> exiftool 8.21-1 shows
> $ exiftool 2_04.cr2 | grep -i lens
> Lens Type            : Canon EF 20-35mm f/3.5-4.5 USM or Tamron Lens
> Lens Model           : 10-17mm
> Lens Drive No AF     : Focus search on
> Lens AF Stop Button  : AF stop
> Lens                 : 10.0 - 17.0 mm
> Lens ID              : Unknown (160) 10-17mm
> Lens                 : 10.0 - 17.0 mm (35 mm equivalent: 9.8 - 16.6 mm)
>
>
> I assume that before lensfun database can be updated for the various
> corrections, it depends on identification of the lens from Exif,
> doesn't it?
>
> Can someone advise on how to proceed to help the developers to recognise
> the lens from Canon's Exif?

Lens description string come from Exif of course, and Exiv2 is used
here to extract this string. Exiv2 need to be patched to improve
string from Exif of course...

Please open a file to KDE/digiKam bugzilla. I will CC Andreas Huggel
who is Exiv2 lead developper.

Gilles Caulier

>
> Regards,
> Milan
> --
> http://www.milan-knizek.net/
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