Hi,

ooooookay.

First things first: I back home and can confirm the problem being
present in the stable darktable ppa for ubuntu.

Am 17.12.2014 um 19:45 schrieb Bernhard:
> I'm using Pascal's V1.6.0 and LinuxMint17 - when activating the module
> and afterwards expand it I see the lens name, focal length, aperture
> etc. as is given by the EXIF Data in the image information field on the
> left.
> Switching on/off changes the image - I assume that it works correctly.

Yes, it does where it does. As far as I can see it's present with
Olympus Four Thirds camera/lens combinations, but not for Micro Four
Thirds. (And it doesn't concern other makes.) As in january I cannot
tell what happens with FT Olympus lenses on MFT Olympus bodies.

So, if it works for you, Berhard, I assume you didn't test it with Four
Thirds hardware. If indeed you did, this could be quite interesting.

> Matthias Moebius schrieb am 17.12.2014 um 15:10:
>> I have two systems running, on the test system I did compile the
>> 0.3.0-Version. I'm not quite sure how to find out what libs are used
>> by darktable, I googled a bit around and finally used pmap. On the
>> test system it gives (I'm not quite sure if the spelling is correct
>> because I'm not at this system at the moment) something like
>> liblensfun.0.3.0.so and on the main system with native darktable it
>> gave ...0.2.8.so. I will have a look how LD_LIBRARY_PATH is set.

Sounds good and should work, but ...
https://github.com/darktable-org/darktable/blob/darktable-1.6.x/src/common/exif.cc,
line 548 shows that the new behaviour is only present if lensfun > 0.2.8
is present at compile time.

Why that is, i cannot explain. The weird exif behaviour in FT
camera/lenses doesn't depend on the lensfun version. Yes, there had to
be made some changes to the lensfun database as well to match the actual
content of the exif data, but (a) this worked just fine with lensfun
2.8.0 and a change to the xml data files and (b) using the corrected way
for exif with an old lensfun data library didn't break anything that
wasn't broken before.

So, I haven't tried it out, this comes from readin the code, but as far
as I can tell everything should work fine when compiling lensfun 0.3.0
first and then compiling darktable angainst that.

I'll try it at once, but I hope that this helped.

Cheers,
  Jan Niklas

PS: On a personal note, I just migrated my work station to the newest
mint release to be able to use the ppa packages and have an
out-of-the-box solution again. Seems, I'll have to wait for that till
the ppa version for lensfun is upgraded to 0.3.0.

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