/usr/share/lensfun/version_1/slr-ricoh.xml is in liblensfun-data-v1 0.3.2-4.
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<lens>
<maker>Ricoh</maker>
<model>Ricoh XR Rikenon 1:1.4 50mm</model>
<mount>Pentax K</mount>
<cropfactor>1.523</cropfactor>
<calibration>
<!-- Taken with Pentax K-r -->
<distortion model="poly3" focal="50" k1="-0.00302" />
<tca model="poly3" focal="50" br="-0.0000276" vr="1.0001338" bb="0.0000254" vb="0.9998300" />
</calibration>
</lens>
<lens>
<maker>Ricoh</maker>
<model>Ricoh 50mm 1:2.0</model>
<mount>Pentax K</mount>
<cropfactor>1</cropfactor>
<calibration>
<!-- Taken with Sony A7 -->
<distortion model="poly3" focal="50" k1="-0.00408" />
<vignetting model="pa" focal="50" aperture="2" distance="10" k1="-1.2841" k2="1.3206" k3="-0.5942" />
<vignetting model="pa" focal="50" aperture="2" distance="1000" k1="-1.2841" k2="1.3206" k3="-0.5942" />
<vignetting model="pa" focal="50" aperture="2.8" distance="10" k1="-0.0367" k2="-0.8533" k3="0.4734" />
<vignetting model="pa" focal="50" aperture="2.8" distance="1000" k1="-0.0367" k2="-0.8533" k3="0.4734" />
<vignetting model="pa" focal="50" aperture="4" distance="10" k1="-0.2554" k2="0.3092" k3="-0.3180" />
<vignetting model="pa" focal="50" aperture="4" distance="1000" k1="-0.2554" k2="0.3092" k3="-0.3180" />
<vignetting model="pa" focal="50" aperture="5.6" distance="10" k1="-0.2064" k2="0.0696" k3="-0.0244" />
<vignetting model="pa" focal="50" aperture="5.6" distance="1000" k1="-0.2064" k2="0.0696" k3="-0.0244" />
<vignetting model="pa" focal="50" aperture="8" distance="10" k1="-0.1932" k2="0.0325" k3="0.0055" />
<vignetting model="pa" focal="50" aperture="8" distance="1000" k1="-0.1932" k2="0.0325" k3="0.0055" />
<vignetting model="pa" focal="50" aperture="11" distance="10" k1="-0.1940" k2="0.0296" k3="0.0103" />
<vignetting model="pa" focal="50" aperture="11" distance="1000" k1="-0.1940" k2="0.0296" k3="0.0103" />
<vignetting model="pa" focal="50" aperture="16" distance="10" k1="-0.1951" k2="0.0241" k3="0.0171" />
<vignetting model="pa" focal="50" aperture="16" distance="1000" k1="-0.1951" k2="0.0241" k3="0.0171" />
</calibration>
</lens>
</lensdatabase>
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