OK - the base of my problem was a fata morgana.
Exiftool does interpret every value of this Pentax-K10D-image correctly:
exiftool Pentax_K10D.jpeg | grep Focal
Focal Length : 100.0mm
Focal Length In 35mm Format : 150
Focal Length : 100.0mm (35mm equivalent: 150.0mm)
Only the EXIF-module of this Forum shows for whatever reason ten times the value.
But not to appear as a dumbass here, for anyone interested I show a solution in Bash.
F="Pentax_K10D.jpeg"; FL=$(exiftool -FocalLength "$F" | sed -e 's/[^0-9]*\([0-9]*\).*/\1/'); exifto
+ol -FocalLength="$((FL/10))" "$F"
This divides the value of FocalLength by 10.
Maybe there is a more elegant solution for that.
- Cocker :wq
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