/usr/share/lensfun/mil-sigma.xml is in liblensfun-data 0.2.8-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | <lensdatabase>
<lens>
<maker>Sigma</maker>
<!-- The actual name is "Sigma 30mm F2.8 EX DN". The following is the exiv2 name on the NEX-C3. -->
<model>E 30mm F2.8</model>
<mount>Sony E</mount>
<mount>Micro 4/3 System</mount>
<cropfactor>1.534</cropfactor>
<calibration>
<!-- Taken with NEX-C3 -->
<distortion model="poly3" focal="30" k1="-0.00329" />
<tca model="poly3" focal="30" br="-0.0000696" vr="1.0003379" bb="0.0001188" vb="0.9998102" />
<vignetting model="pa" focal="30" aperture="2.8" distance="10" k1="-0.7946" k2="0.5729" k3="-0.1713" />
<vignetting model="pa" focal="30" aperture="2.8" distance="1000" k1="-0.7946" k2="0.5729" k3="-0.1713" />
<vignetting model="pa" focal="30" aperture="4" distance="10" k1="-0.3097" k2="-0.3089" k3="0.2307" />
<vignetting model="pa" focal="30" aperture="4" distance="1000" k1="-0.3097" k2="-0.3089" k3="0.2307" />
<vignetting model="pa" focal="30" aperture="5.6" distance="10" k1="-0.6172" k2="0.5891" k3="-0.2868" />
<vignetting model="pa" focal="30" aperture="5.6" distance="1000" k1="-0.6172" k2="0.5891" k3="-0.2868" />
</calibration>
</lens>
</lensdatabase>
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