Leica Q Lensfun

leica-q.xml

<lensdatabase version="1">

    <camera>
        <maker>Leica Camera AG</maker>
        <model>Leica Q (Typ 116)</model>
        <mount>leicaQTyp116</mount>
        <cropfactor>1</cropfactor>
    </camera>

    <lens>
        <maker>Leica Camera AG</maker>
        <maker lang="en">Leica</maker>
        <model>28.0mm f/1.7</model>
        <mount>leicaQTyp116</mount>
        <cropfactor>1</cropfactor>
        <calibration>
            <!-- results obtained using sample RAW from dpreview.com -->
            <distortion model="ptlens" focal="28" a="0.00098" b="-0.043" c="0.01683"/>
            <tca model="poly3" focal="28" br="-0.0000329" vr="1.0002023" bb="0.0000845" vb="0.9999781"/>
        </calibration>
    </lens>

</lensdatabase>

put it in home/USER/.local/share/lensfun

found it on the net - i don claim credit for this