/usr/share/lensfun/version_1/slr-schneider.xml is in liblensfun-data-v1 0.3.2-4.
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<lens>
<maker>Schneider</maker>
<model>Schneider 28mm f/2.8 PC</model>
<mount>Canon EF</mount>
<mount>Nikon F AI-S</mount>
<cropfactor>1.0</cropfactor>
<calibration>
<distortion model="ptlens" focal="28" a="0.009514" b="-0.027901" c="0" />
</calibration>
</lens>
<lens>
<maker>Schneider</maker>
<model>D-Xenon 1:3.5-5.6 18-55mm AL</model>
<mount>Pentax KAF2</mount>
<!-- Average crop factor of non-Canon APS-C cameras -->
<cropfactor>1.53</cropfactor>
<calibration>
<distortion model="ptlens" focal="18" a="0.004593" b="-0.021008" c="0" />
<distortion model="ptlens" focal="21" a="0.00371" b="-0.014625" c="0" />
<distortion model="ptlens" focal="24" a="0" b="-0.004166" c="0" />
<distortion model="ptlens" focal="33" a="0" b="0.000528" c="0" />
<distortion model="ptlens" focal="55" a="0" b="0.003215" c="0" />
</calibration>
</lens>
<lens>
<maker>Schneider</maker>
<model>D-Xenon 1:4-5.6 50-200mm AL</model>
<mount>Pentax KAF2</mount>
<!-- Average crop factor of non-Canon APS-C cameras -->
<cropfactor>1.53</cropfactor>
<calibration>
<distortion model="poly3" focal="50" k1="-0.004038" />
<distortion model="poly3" focal="63" k1="0.001607" />
<distortion model="poly3" focal="95" k1="0.007697" />
<distortion model="poly3" focal="125" k1="0.007991" />
<distortion model="poly3" focal="138" k1="0.008036" />
<distortion model="poly3" focal="160" k1="0.007909" />
<distortion model="poly3" focal="180" k1="0.009293" />
<distortion model="poly3" focal="200" k1="0.007685" />
</calibration>
</lens>
<lens>
<maker>Schneider</maker>
<model>Schneider Retina-Curtagon 1:4/28mm</model>
<mount>DKL</mount>
<cropfactor>1.529</cropfactor>
<calibration>
<!-- Taken with Fujifilm X-M1 -->
<distortion model="ptlens" focal="28" a="0.00591" b="-0.01953" c="0.00935" />
<tca model="poly3" focal="28" vr="1.0004290" vb="0.9997397" />
</calibration>
</lens>
</lensdatabase>
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