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/usr/share/lensfun/version_1/slr-ussr.xml is in liblensfun-data-v1 0.3.2-3.

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The actual contents of the file can be viewed below.

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<!--
    This file contains some of the cameras and lenses from:
    "Krasnogorsky zavod" JSC (http://www.zenit-foto.ru/english/index.htm)
    "Belarusian Optical and Mechanical Associtaion" (http://www.belomo.by/)
-->
<lensdatabase version="1">

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit 122</model>
        <model lang="ru">Зенит 122</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit 122K</model>
        <model lang="ru">Зенит 122K</model>
        <mount>Pentax K</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit 212K</model>
        <model lang="ru">Зенит 212K</model>
        <mount>Pentax K</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit 312K</model>
        <model lang="ru">Зенит 312K</model>
        <mount>Pentax K</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit 412LS</model>
        <model lang="ru">Зенит 412LS</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <camera>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>Zenit KM</model>
        <model lang="ru">Зенит KM</model>
        <mount>Pentax K</mount>
        <cropfactor>1.0</cropfactor>
    </camera>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC Mir-20M 3.5/20</model>
        <model lang="ru">МС Мир-20М 3.5/20</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC Zenitar 2.8/16</model>
        <model lang="ru">МС Зенитар 2.8/16</model>
        <type>fisheye</type>
        <mount>M42</mount>
        <mount>Pentax K</mount>
        <mount>Nikon F</mount>
        <cropfactor>1.0</cropfactor>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC Zenitar 2/50</model>
        <model lang="ru">МС Зенитар 2/50</model>
        <mount>M42</mount>
        <mount>Pentax K</mount>
        <cropfactor>1.0</cropfactor>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC APO Telezenitar 2.8/135</model>
        <model lang="ru">МС АПО Телезенитар 2.8/135</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC APO Telezenitar 4.5/300</model>
        <model lang="ru">МС АПО Телезенитар 4.5/300</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC Variozenitar-K 2.8-3.5/25-45</model>
        <model lang="ru">МС Вариозенитар-К 2.8-3.5/25-45</model>
        <mount>M42</mount>
        <cropfactor>1.0</cropfactor>
        <aperture min="2.8" />
        <focal min="25" max="45" />
    </lens>

    <lens>
        <maker>BelOMO</maker>
        <maker lang="ru">БелОМО</maker>
        <model>MC Peleng 3.5/8</model>
        <model lang="ru">МС Пеленг 3.5/8</model>
        <mount>M42</mount>
        <mount>Pentax K</mount>
        <mount>Nikon F</mount>
        <mount>Canon EF</mount>
        <cropfactor>1.0</cropfactor>
        <aperture min="3.5" max="16" />
        <type>fisheye</type>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <maker lang="ru">КМЗ</maker>
        <model>MC MTO 11CA 10/1000</model>
        <mount>M42</mount>
        <focal value="1000" />
        <aperture value="10" />
        <cropfactor>1.531</cropfactor>
        <calibration>
            <distortion model="poly3" focal="1000" k1="0.00451" />
        </calibration>
    </lens>

    <lens>
        <maker>KMZ</maker>
        <model>MC Helios-44M-4 58mm 1:2</model>
        <mount>M42</mount>
        <cropfactor>1.538</cropfactor>
        <calibration>
            <!-- Taken with Pentax K20D -->
            <distortion model="poly3" focal="58" k1="0.00131" />
            <tca model="poly3" focal="58" vr="1.0000037" vb="0.9999377" />
            <vignetting model="pa" focal="58" aperture="2" distance="10" k1="-0.7541" k2="0.5658" k3="-0.2168" />
            <vignetting model="pa" focal="58" aperture="2" distance="1000" k1="-0.7541" k2="0.5658" k3="-0.2168" />
            <vignetting model="pa" focal="58" aperture="2.8" distance="10" k1="-0.1611" k2="0.0829" k3="-0.0613" />
            <vignetting model="pa" focal="58" aperture="2.8" distance="1000" k1="-0.1611" k2="0.0829" k3="-0.0613" />
            <vignetting model="pa" focal="58" aperture="4" distance="10" k1="-0.1624" k2="0.0504" k3="-0.0082" />
            <vignetting model="pa" focal="58" aperture="4" distance="1000" k1="-0.1624" k2="0.0504" k3="-0.0082" />
            <vignetting model="pa" focal="58" aperture="5.6" distance="10" k1="-0.1559" k2="0.0218" k3="0.0096" />
            <vignetting model="pa" focal="58" aperture="5.6" distance="1000" k1="-0.1559" k2="0.0218" k3="0.0096" />
            <vignetting model="pa" focal="58" aperture="8" distance="10" k1="-0.1870" k2="0.0627" k3="-0.0081" />
            <vignetting model="pa" focal="58" aperture="8" distance="1000" k1="-0.1870" k2="0.0627" k3="-0.0081" />
            <vignetting model="pa" focal="58" aperture="11" distance="10" k1="-0.2473" k2="0.1722" k3="-0.0667" />
            <vignetting model="pa" focal="58" aperture="11" distance="1000" k1="-0.2473" k2="0.1722" k3="-0.0667" />
            <vignetting model="pa" focal="58" aperture="16" distance="10" k1="-0.3149" k2="0.2956" k3="-0.1347" />
            <vignetting model="pa" focal="58" aperture="16" distance="1000" k1="-0.3149" k2="0.2956" k3="-0.1347" />
        </calibration>
    </lens>

</lensdatabase>