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<lensdatabase version="1">

   <lens>
	    <maker>Samyang</maker>
	    <model>Samyang 7.5mm f/3.5 UMC Fish-eye MFT</model>
	    <model lang="de">Samyang 7.5mm f/3.5 UMC Fischauge MFT</model>
	    <focal value="7.5" />
	    <aperture min="3.5" max="22" />
	    <mount>Micro 4/3 System</mount>
	    <type>fisheye</type>
	    <cropfactor>2</cropfactor>
            <aspect-ratio>4:3</aspect-ratio>
	    <calibration>
	      <distortion focal="7.5" model="ptlens" a="-0.0133116" b="0.00822383" c="-0.0180619" />
            <tca model="poly3" focal="7.5" br="-0.0001120" vr="1.0003181" bb="0.0000315" vb="0.9999183" />
            <vignetting model="pa" focal="7.5" aperture="3.5" distance="0.09" k1="-0.6898" k2="0.5629" k3="-0.2798" />
            <vignetting model="pa" focal="7.5" aperture="3.5" distance="0.18" k1="-1.0041" k2="1.6690" k3="-0.9910" />
            <vignetting model="pa" focal="7.5" aperture="3.5" distance="0.54" k1="-1.0954" k2="1.8097" k3="-1.0871" />
            <vignetting model="pa" focal="7.5" aperture="3.5" distance="1000" k1="-1.1157" k2="1.9882" k3="-1.2723" />
            <vignetting model="pa" focal="7.5" aperture="4" distance="0.09" k1="-0.6381" k2="0.4763" k3="-0.2415" />
            <vignetting model="pa" focal="7.5" aperture="4" distance="0.18" k1="-0.8935" k2="1.3156" k3="-0.7649" />
            <vignetting model="pa" focal="7.5" aperture="4" distance="0.54" k1="-1.0314" k2="1.6246" k3="-0.9735" />
            <vignetting model="pa" focal="7.5" aperture="4" distance="1000" k1="-1.1245" k2="2.0645" k3="-1.3261" />
            <vignetting model="pa" focal="7.5" aperture="5.6" distance="0.09" k1="-0.7704" k2="1.0367" k3="-0.6094" />
            <vignetting model="pa" focal="7.5" aperture="5.6" distance="0.18" k1="-1.0225" k2="1.7532" k3="-0.9869" />
            <vignetting model="pa" focal="7.5" aperture="5.6" distance="0.54" k1="-1.1394" k2="2.0518" k3="-1.2608" />
            <vignetting model="pa" focal="7.5" aperture="5.6" distance="1000" k1="-1.2338" k2="2.5227" k3="-1.6312" />
            <vignetting model="pa" focal="7.5" aperture="8" distance="0.09" k1="-0.8748" k2="1.2274" k3="-0.6025" />
            <vignetting model="pa" focal="7.5" aperture="8" distance="0.18" k1="-0.9885" k2="1.6290" k3="-0.8701" />
            <vignetting model="pa" focal="7.5" aperture="8" distance="0.54" k1="-0.9302" k2="1.1116" k3="-0.4253" />
            <vignetting model="pa" focal="7.5" aperture="8" distance="1000" k1="-0.9312" k2="1.1169" k3="-0.4030" />
            <vignetting model="pa" focal="7.5" aperture="22" distance="0.09" k1="-0.8023" k2="0.9555" k3="-0.4032" />
            <vignetting model="pa" focal="7.5" aperture="22" distance="0.18" k1="-0.9166" k2="1.2514" k3="-0.6183" />
            <vignetting model="pa" focal="7.5" aperture="22" distance="0.54" k1="-0.9866" k2="1.2614" k3="-0.5698" />
            <vignetting model="pa" focal="7.5" aperture="22" distance="1000" k1="-1.0589" k2="1.5841" k3="-0.8397" />
	    </calibration>
    </lens>

    <lens>
        <maker>Samyang</maker>
        <model>Samyang 8mm f/2.8 UMC Fish-eye</model>
        <model lang="de">Samyang 8mm f/2.8 UMC Fischauge</model>
        <mount>Sony E</mount>
        <mount>Fujifilm X</mount>
        <mount>Samsung NX</mount>
        <cropfactor>1.534</cropfactor>
        <type>stereographic</type>
        <calibration>
            <!-- Taken with Sony NEX-7 -->
            <!-- Measured with a 360° panorama -->
            <real-focal-length focal="8" real-focal="8.405" />
            <distortion model="ptlens" focal="8" a="0.02036" b="-0.08028" c="0.01446" />
            <tca model="poly3" focal="8" br="-0.0000138" vr="1.0000964" bb="0.0001036" vb="1.0000325" />
            <vignetting model="pa" focal="8" aperture="2.8" distance="0.3" k1="-1.4924" k2="1.0081" k3="-0.3500" />
            <vignetting model="pa" focal="8" aperture="2.8" distance="1" k1="-1.5090" k2="0.9829" k3="-0.3162" />
            <vignetting model="pa" focal="8" aperture="2.8" distance="1000" k1="-1.5018" k2="0.9506" k3="-0.2946" />
            <vignetting model="pa" focal="8" aperture="4" distance="0.3" k1="-0.9478" k2="0.6408" k3="-0.4329" />
            <vignetting model="pa" focal="8" aperture="4" distance="1" k1="-1.0029" k2="0.7332" k3="-0.4824" />
            <vignetting model="pa" focal="8" aperture="4" distance="1000" k1="-1.0418" k2="0.7092" k3="-0.4377" />
            <vignetting model="pa" focal="8" aperture="5.6" distance="0.3" k1="-1.0401" k2="0.9822" k3="-0.5842" />
            <vignetting model="pa" focal="8" aperture="5.6" distance="1" k1="-1.0795" k2="1.0230" k3="-0.6008" />
            <vignetting model="pa" focal="8" aperture="5.6" distance="1000" k1="-1.1067" k2="1.0544" k3="-0.6145" />
            <vignetting model="pa" focal="8" aperture="8" distance="0.3" k1="-1.0299" k2="0.9615" k3="-0.5692" />
            <vignetting model="pa" focal="8" aperture="8" distance="1" k1="-1.0667" k2="0.9822" k3="-0.5667" />
            <vignetting model="pa" focal="8" aperture="8" distance="1000" k1="-1.0408" k2="0.9345" k3="-0.5484" />
            <vignetting model="pa" focal="8" aperture="22" distance="0.3" k1="-1.0752" k2="1.0060" k3="-0.5789" />
            <vignetting model="pa" focal="8" aperture="22" distance="1" k1="-1.0814" k2="1.0593" k3="-0.6292" />
            <vignetting model="pa" focal="8" aperture="22" distance="1000" k1="-1.0709" k2="0.9444" k3="-0.5355" />
        </calibration>
    </lens>

    <lens>
        <maker>Samyang</maker>
        <model>Samyang 50mm f/1.4 AS UMC</model>
        <mount>Sony E</mount>
        <cropfactor>1.534</cropfactor>
        <calibration>
            <!-- Taken with Sony NEX-7 -->
            <distortion model="poly3" focal="50" k1="-0.00445" />
            <tca model="poly3" focal="50"  vr="1.0001" vb="1.0001" />
        </calibration>
    </lens>

    <lens>
        <maker>Samyang</maker>
        <model>Samyang 12mm f/2.0 NCS CS</model>
        <mount>Sony E</mount>
        <cropfactor>1.534</cropfactor>
        <calibration>
            <!-- Taken with Sony NEX-7 -->
            <distortion model="ptlens" focal="12" a="0.0097" b="-0.04108" c="0.03623" />
            <tca model="poly3" focal="12" br="0.0000203" vr="1.0001380" bb="0.0002099" vb="1.0001907" />
        </calibration>
    </lens>

</lensdatabase>