<lensdatabase version="1">

    <lens>
        <!-- Also update copy at "Carl Zeiss Distagon T* 2,8/21 ZE" below. -->
        <maker>Zeiss</maker>
        <model>Carl Zeiss Distagon T* 2,8/21 ZF.2</model>
        <mount>Nikon F AI-S</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <!-- Taken with Nikon D800E -->
            <distortion model="ptlens" focal="21" a="0.03083" b="-0.0633" c="0.01093" />
            <tca model="linear" focal="21" kr="1.0001" kb="1.0001" />
        </calibration>
    </lens>

    <lens>
        <!-- Also update copy at "Carl Zeiss Distagon T* 2,8/21 ZF.2" above. -->
        <maker>Zeiss</maker>
        <model>Carl Zeiss Distagon T* 2,8/21 ZE</model>
        <mount>Canon EF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="21" a="0.03083" b="-0.0633" c="0.01093" />
            <tca model="linear" focal="21" kr="1.0001" kb="1.0001" />
        </calibration>
    </lens>

    <lens>
        <maker>Zeiss</maker>
        <model>Carl Zeiss Jena 1Q Biotar 1:2 f=58mm T</model>
        <mount>M42</mount>
        <cropfactor>1.538</cropfactor>
        <calibration>
            <!-- Taken with Pentax K20D -->
            <distortion model="poly3" focal="58" k1="0.0017" />
            <tca model="poly3" focal="58" vr="0.9999881" vb="0.9999867" />
        </calibration>
    </lens>

</lensdatabase>