[Digikam-users] Re: lens-recognition

[Michael Eschweiler]

Am Sonntag, 16. Januar 2011, 16:09:29 schrieb Michael Eschweiler:
> Hi,
> I've been using digikam since three years ago and with every version it's
> improving - fantastic! As I am not a professional I don't use digikam every
> day. Therefore it's a little bit difficult to date the following problem:
> More or less since about two months ago digikam doesn't (import and)
> expose the correct lens data.
> With my EOS 40D I am using a Tokina zoom (f4, 12-24mm), a Tamron zoom
> (f2.8, 17 - 50mm), and a Tamron zoom (f4-5.6, 28 - 300 mm).
> With my older pictures I (still) find the lens type correctly displayed in
> the exif data. This means the Tokina is identified as "12-24mm", the
> smaller Tamron zoom as "17-50mm" and the telezoom as "28-300mm".
> With the fotos I imported within the last two month I found that only the
> telezoom is identified correctly, now more completely as "Tamron AF
> 28-300mm" (not "28-300mm" as before). On the other hand the Tokina lens is
> intentified as "Canon EF 20-35mm" and the 17-50mm-zoom gets a number: 161.
> I suppose that it is a software-problem because when I open the same
> picture with irfanview (Windows XP) the correct lens data are displayed.
> What can I do in order to get the lenses correctly identified within
> digikam.
> Thanks in advance,
> Michael
> P.S.: Im using digikam 1.7.0 on openSuSE 11.3 - the x86_64 - Version with
> KDE 4.5


I just had a look a some pictures with exiftool: There I found some 
contradicting data:
For the Tamron-17-50mm-zoom exiftools says:
Lens Type : Canon EF 28-70mm f/2.8L or Sigma or Tamron Lens
Long Focal                      : 17 mm
Short Focal                     : 50 mm
..
Lens          : 17.0 - 50.0 mm
Lens ID      : Tamron AF 17-50mm f/2.8 Di-II LD Aspherical

digikam gives back: 161

For the the Tamron-28-300mm-zoom exiftools says:
Lens Type   : Canon EF 28-200mm f/3.5-5.6 or Tamron Lens
Long Focal                      : 28 mm
Short Focal                     : 300 mm
..
Lens      : 28.0 - 300.0 mm
Lens ID  : Tamron AF 28-300mm f/3.5-6.3 XR Di VC LD Aspherical [IF] Macro 
Model A20

here digikam displays the correct lens: Tamron AF 28-300mm f/3.5-6.3 XR Di VC 
LD Aspherical [IF] Macro Model A20

And last but not least exiftool identifies the Tokina lens as:
Lens Type                       : Canon EF 20-35mm f/3.5-4.5 USM or Tamron 
Lens
Long Focal                      : 24 mm
Short Focal                     : 12 mm
..
Lens                            : 12.0 - 24.0 mm
Lens ID                         : Unknown (160) 12-24mm

in this case digikam tells me that I used a Canon EF 20-35mm.
 
It seems to me that digikam is using different ways to handle the exif-data in 
order to determine the lens.

Is there a way to persuade digikam to display the correct lens data?
Thanks!
Michael