<lensdatabase version="1">
    <lens>
        <maker>Schneider</maker>
        <model>Schneider 28mm f/2.8 PC</model>
        <mount>Canon EF</mount>
        <mount>Nikon F AI-S</mount>
        <cropfactor>1</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>
