/usr/share/lensfun/slr-samyang.xml is in liblensfun-data 0.2.8-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<lens>
<maker>Samyang</maker>
<model>Samyang 14mm f/2.8 ED AS IF UMC</model>
<mount>Canon EF</mount>
<cropfactor>1.0</cropfactor>
<calibration>
<distortion model="ptlens" focal="14" a="0.04015" b="-0.07043" c="-0.05466" />
<tca model="poly3" focal="14" br="0.0000198" vr="0.9999690" bb="-0.0001334" vb="1.0003226" />
</calibration>
</lens>
<lens>
<maker>Samyang</maker>
<model>Samyang 500mm f/6.3 MC IF Mirror Lens</model>
<mount>T2</mount>
<focal value="500" />
<aperture value="6.3" />
<!-- FixMe: Actually cropfactor 1.534 -->
<cropfactor>1.5</cropfactor>
<calibration>
<!-- Taken with NEX-7 -->
<distortion model="poly3" focal="500" k1="0" />
<tca model="linear" focal="500" kr="1" kb="1" />
<vignetting model="pa" focal="500" aperture="6.3" distance="10" k1="-0.7756" k2="0.8291" k3="-0.3723" />
<vignetting model="pa" focal="500" aperture="6.3" distance="1000" k1="-0.7756" k2="0.8291" k3="-0.3723" />
</calibration>
</lens>
</lensdatabase>
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