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/usr/share/lensfun/slr-contax.xml is in liblensfun-data 0.2.8-3.

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The actual contents of the file can be viewed below.

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<lensdatabase>

    <mount>
        <name>Contax/Yashica</name>
        <compat>M42</compat>
        <compat>T2</compat>
        <compat>Generic</compat>
    </mount>

    <camera>
        <maker>Contax</maker>
        <model>35mm film: full frame</model>
        <mount>Contax/Yashica</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <lens>
        <maker>Contax</maker>
        <model>Zeiss 21mm f/2.8 Distagon</model>
        <mount>Contax/Yashica</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="21" a="0.021925" b="-0.043445" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Contax</maker>
        <model>Zeiss 28mm f/2.8 Distagon</model>
        <mount>Contax/Yashica</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="28" a="0.007448" b="-0.019182" c="0" />
        </calibration>
    </lens>

</lensdatabase>