[digikam] [Bug 367935] New: Calculate 35mm equivalent Focal Length on import for Database field focalLength35

[Tobias Philipp via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=367935

            Bug ID: 367935
           Summary: Calculate 35mm equivalent Focal Length on import for
                    Database field focalLength35
           Product: digikam
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Import-PostProcessing
          Assignee: digikam-devel at kde.org
          Reporter: maillist at tobiasphilipp.de

Created attachment 100831
  --> https://bugs.kde.org/attachment.cgi?id=100831&action=edit
Screenshot digikam with seleted imagr from my panasonic camer showing the 35mm
focal length info

Hi,

i'm using a self written tool to analyze my pictures based on the info in the
digikam4.db file to 
get the most used aperture, focal lengths, day with the most pictures taken
etc.

In mid 2014 i changed my main camera from a Panasonic G5 to a Olympus OM-D
E-M10.
The new Olympus camera don't fill the the exif field "FocalLengthIn35mmFilm"
like my Panasonic camera before.

Example:
jhead -v benjamin-_2016.08.18_20-03-58_2490.JPG | grep 'Focal\|model\|make' 
        FocalLength = 20/1
Camera make  : OLYMPUS IMAGING CORP.  
Camera model : E-M10           
Focal length : 20.0mm

jhead -v mulata_2014.07.06_14-27-02_0807.JPG | grep 'Focal\|model\|make'
        FocalLength = 450/10
        FocalLengthIn35mmFilm = 93
Camera make  : Panasonic
Camera model : DMC-G5
Focal length : 45.0mm  (35mm equivalent: 93mm)

After importing the pictures, the field "focalLength35" in the digikam database
has no value for the pictures from the olympus camera.

I  noticed, that the 35mm info is also missing in the exif info tab. See
screenshots.

it's hard to compare images from cameras with different seized sensors without
the 35mm focal length as common base.

The tool "exiftool" calculates the missing info  (i think throug other
information stored in the exifs like e.g. sensor dimension in mm):

exiftool *2490* | grep 'Focal\|Make\|Model'
Make                            : OLYMPUS IMAGING CORP.
Camera Model Name               : E-M10
Focal Length                    : 20.0 mm
Focal Plane Diagonal            : 21.6 mm
Focal Length                    : 20.0 mm (35 mm equivalent: 40.1 mm)

I think digikam should also calculate the missing focal length, if possible, on
import.
It is not possible to calculate it only with the informations stored in the
database.

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