Hi all,
That is *really* bad advice.
Lensfun has broken their ABI in <= 0.3.2, without bumping the API version.
So doing that will result in all kinds of subtle bugs, like
https://redmine.darktable.org/issues/11626#note-10 and so on...
I think Roman is right here. There are subtle problem (the most
important one is that it seems that some lens correction defaults to a
thorby-fisheye type, giving funny but horribly wrong results.
So the problem is why sometime the new database entry are not working
for 0.2.8. For example, the entry below seems correct (and it is
correctly selected with the 0.3.2 hack, albeit with the fisheye problem
above --- switch to rectilinear and it works), but darktable refuses to
let me select it with the 0.2.8:
http://pix.toile-libre.org/?img=1495308076.png
Entry in question:
<lensdatabase>
<camera>
<maker>Panasonic</maker>
<model>DMC-TZ100</model>
<mount>panasonicTZ100</mount>
<cropfactor>2.75</cropfactor>
</camera>
<lens>
<maker>Leica</maker>
<model>DMC-TZ100 & compatibles</model>
<model lang="en">fixed lens</model>
<model lang="de">festes Objektiv</model>
<mount>panasonicTZ100</mount>
<cropfactor>2.75</cropfactor>
<aspect-ratio>3:2</aspect-ratio>
<calibration>
<distortion model="ptlens" focal="9.1" a="0.00708902"
b="-0.040959" c="-0.0636536"/>
<distortion model="ptlens" focal="11" a="0.0095907"
b="-0.0535213" c="0.00920877"/>
<distortion model="ptlens" focal="14.6" a="0"
b="-0.0124246" c="0"/>
<distortion model="ptlens" focal="18.2" a="0"
b="-0.00155103" c="0"/>
<distortion model="ptlens" focal="23.7" a="0"
b="0.00368039" c="0"/>
<distortion model="ptlens" focal="36.6" a="0"
b="0.00140267" c="0"/>
<distortion model="ptlens" focal="54.8" a="0"
b="0.00153697" c="0"/>
<distortion model="ptlens" focal="91" a="0"
b="-0.000878659" c="0"/>
<tca model="poly3" focal="9.1" vr="1.0003000"
vb="1.0002000"/>
<tca model="poly3" focal="11" vr="1.0005000" vb="1.0002000"/>
<tca model="poly3" focal="14.6" vr="1.0005000"
vb="1.0000000"/>
<tca model="poly3" focal="18.2" vr="1.0005000"
vb="0.9999000"/>
<tca model="poly3" focal="23.7" vr="1.0004000"
vb="0.9999000"/>
<tca model="poly3" focal="36.6" vr="1.0000000"
vb="1.0000000"/>
<tca model="poly3" focal="54.8" vr="0.9997000"
vb="1.0000000"/>
<tca model="poly3" focal="91" vr="0.9996000" vb="0.9995000"/>
</calibration>
</lens>
</lensdatabase>
--
Romano Giannetti
http://www.rgtti.com/
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