<lensdatabase version="1">
    <lens>
        <maker>Tokina</maker>
        <model>E 20mm f/2</model>
        <mount>Sony E</mount>
        <cropfactor>1</cropfactor>
        <calibration>
            <!-- Taken with Sony Alpha 7R -->
            <distortion model="ptlens" focal="20" a="0.0236801" b="-0.0528733" c="0.0242738"/>
            <tca model="poly3" focal="20" vr="1.0001" vb="1.00005"/>
        </calibration>
    </lens>
    <lens>
        <maker>Tokina</maker>
        <model>Tokina AT-X M35 PRO DX (AF 35mm f/2.8 Macro)</model>
        <mount>Nikon F AF</mount>
        <mount>Canon EF</mount>
        <cropfactor>1.534</cropfactor>
        <calibration>
            <!-- Taken with Nikon D7500 -->
            <distortion model="ptlens" focal="35.0" a="0.004" b="-0.014" c="0.012"/>
            <tca model="poly3" focal="35.0" br="-0.0000198" vr="1.0002517" bb="0.0001156" vb="0.9997726"/>
        </calibration>
    </lens>
</lensdatabase>
