<lensdatabase>

    <mount>
        <name>Sigma SA</name>
        <compat>Generic</compat>
    </mount>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD1</model>
        <model lang="en">SD1</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.5</cropfactor>
    </camera>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD1 Merrill</model>
        <model lang="en">SD1 Merrill</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.5</cropfactor>
    </camera>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD9</model>
        <model lang="en">SD9</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.7</cropfactor>
    </camera>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD10</model>
        <model lang="en">SD10</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.7</cropfactor>
    </camera>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD14</model>
        <model lang="en">SD14</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.7</cropfactor>
    </camera>

    <camera>
        <maker>SIGMA</maker>
        <maker lang="en">Sigma</maker>
        <model>SIGMA SD15</model>
        <model lang="en">SD15</model>
        <mount>Sigma SA</mount>
        <cropfactor>1.7</cropfactor>
    </camera>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 10-20mm f/4-5.6 EX DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF-S</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="10" a="-0.017985" b="0.026145" c="0" />
            <distortion model="ptlens" focal="12" a="-0.008171" b="0.018035" c="0" />
            <distortion model="ptlens" focal="14" a="0" b="0.005868" c="0" />
            <distortion model="ptlens" focal="17" a="0" b="0.006362" c="0" />
            <distortion model="ptlens" focal="20" a="0" b="0.005077" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 12-24mm f/4.5-5.6 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="12" a="0.004893" b="-0.019407" c="0" />
            <distortion model="ptlens" focal="15" a="0.005113" b="-0.014337" c="0" />
            <distortion model="ptlens" focal="17" a="0.005379" b="-0.013087" c="0" />
            <distortion model="ptlens" focal="19" a="0.006028" b="-0.012828" c="0" />
            <distortion model="ptlens" focal="21" a="0.00375" b="-0.007426" c="0" />
            <distortion model="ptlens" focal="24" a="0.002951" b="-0.004156" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 15-30mm f/3.5-4.5 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="15" a="0.009928" b="-0.033322" c="0" />
            <distortion model="ptlens" focal="17" a="0.006714" b="-0.023166" c="0" />
            <distortion model="ptlens" focal="18" a="0.00878" b="-0.025329" c="0" />
            <distortion model="ptlens" focal="20" a="0.010135" b="-0.026175" c="0" />
            <distortion model="ptlens" focal="23" a="0.007144" b="-0.018882" c="0" />
            <distortion model="ptlens" focal="25" a="0.009469" b="-0.02075" c="0" />
            <distortion model="ptlens" focal="26" a="0.008222" b="-0.017584" c="0" />
            <distortion model="ptlens" focal="28" a="0.006456" b="-0.012099" c="0" />
            <distortion model="ptlens" focal="30" a="0.004942" b="-0.008935" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 17-35mm f/2.8-4 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="17" a="0.007263" b="-0.02454" c="0" />
            <distortion model="ptlens" focal="20" a="0.006421" b="-0.021536" c="0" />
            <distortion model="ptlens" focal="24" a="0.008849" b="-0.023843" c="0" />
            <distortion model="ptlens" focal="28" a="0" b="-0.004158" c="0" />
            <distortion model="ptlens" focal="35" a="0" b="-0.002715" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 17-70mm f/2.8-4.5 DC Macro</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="17" a="0.019088" b="-0.048894" c="0" />
            <distortion model="ptlens" focal="19" a="0.010938" b="-0.030356" c="0" />
            <distortion model="ptlens" focal="23" a="0.01063" b="-0.026746" c="0" />
            <distortion model="ptlens" focal="25" a="0.001877" b="-0.005367" c="0" />
            <distortion model="ptlens" focal="30" a="-0.001844" b="0.003931" c="0" />
            <distortion model="ptlens" focal="40" a="-0.002705" b="0.008106" c="0" />
            <distortion model="ptlens" focal="53" a="0" b="0.003542" c="0" />
            <distortion model="ptlens" focal="70" a="0" b="0.003858" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-50mm f/2.8 EX DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.012979" b="-0.036394" c="0" />
            <distortion model="ptlens" focal="23" a="0.007147" b="-0.017687" c="0" />
            <distortion model="ptlens" focal="28" a="0" b="0" c="0" />
            <distortion model="ptlens" focal="34" a="0" b="0.001032" c="0" />
            <distortion model="ptlens" focal="50" a="0" b="0.002512" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-50mm f/2.8 EX DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.011366" b="-0.034328" c="0" />
            <distortion model="ptlens" focal="21" a="0.006142" b="-0.017401" c="0" />
            <distortion model="ptlens" focal="24" a="0.0048" b="-0.013589" c="0" />
            <distortion model="ptlens" focal="28" a="0" b="0" c="0" />
            <distortion model="ptlens" focal="35" a="0" b="0.002094" c="0" />
            <distortion model="ptlens" focal="43" a="0" b="0.002878" c="0" />
            <distortion model="ptlens" focal="50" a="0" b="0.003021" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-50mm f/3.5-5.6 DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.018244" b="-0.048901" c="0" />
            <distortion model="ptlens" focal="20" a="0.013163" b="-0.038177" c="0" />
            <distortion model="ptlens" focal="22" a="0.008797" b="-0.028701" c="0" />
            <distortion model="ptlens" focal="26" a="0.004579" b="-0.017014" c="0" />
            <distortion model="ptlens" focal="30" a="0.002405" b="-0.011562" c="0" />
            <distortion model="ptlens" focal="34" a="0.002363" b="-0.00852" c="0" />
            <distortion model="ptlens" focal="39" a="0" b="-0.002352" c="0" />
            <distortion model="ptlens" focal="44" a="0" b="-0.002108" c="0" />
            <distortion model="ptlens" focal="50" a="0" b="-0.00147" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-125mm f/3.5-5.6 (3.3-5.6) DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.028249" b="-0.061326" c="0" />
            <distortion model="ptlens" focal="26" a="0.008998" b="-0.008014" c="0" />
            <distortion model="ptlens" focal="38" a="0.004437" b="0.005654" c="0" />
            <distortion model="ptlens" focal="60" a="0" b="0.011257" c="0" />
            <distortion model="ptlens" focal="100" a="0" b="0.011071" c="0" />
            <distortion model="ptlens" focal="125" a="0" b="0.010822" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-125mm f/3.5-5.6 (3.3-5.6) DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.02211" b="-0.050462" c="0" />
            <distortion model="ptlens" focal="23" a="0.016565" b="-0.027307" c="0" />
            <distortion model="ptlens" focal="30" a="0.011429" b="-0.013359" c="0" />
            <distortion model="ptlens" focal="38" a="0" b="0.012386" c="0" />
            <distortion model="ptlens" focal="51" a="0" b="0.013262" c="0" />
            <distortion model="ptlens" focal="67" a="0" b="0.011758" c="0" />
            <distortion model="ptlens" focal="87" a="0" b="0.011008" c="0" />
            <distortion model="ptlens" focal="109" a="0" b="0.01145" c="0" />
            <distortion model="ptlens" focal="125" a="0" b="0.009078" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-200mm f/3.5-6.3 DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.027521" b="-0.063244" c="0" />
            <distortion model="ptlens" focal="22" a="0.016154" b="-0.029806" c="0" />
            <distortion model="ptlens" focal="26" a="0.014824" b="-0.025689" c="0" />
            <distortion model="ptlens" focal="34" a="0.011421" b="-0.011743" c="0" />
            <distortion model="ptlens" focal="46" a="0" b="0.014338" c="0" />
            <distortion model="ptlens" focal="78" a="0" b="0.009621" c="0" />
            <distortion model="ptlens" focal="135" a="0" b="0.012591" c="0" />
            <distortion model="ptlens" focal="200" a="0" b="0.011133" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-200mm f/3.5-6.3 DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.018238" b="-0.045992" c="0" />
            <distortion model="ptlens" focal="21" a="0.013683" b="-0.026594" c="0" />
            <distortion model="ptlens" focal="24" a="0.007113" b="-0.008911" c="0" />
            <distortion model="ptlens" focal="33" a="0" b="0.010791" c="0" />
            <distortion model="ptlens" focal="59" a="0" b="0.012006" c="0" />
            <distortion model="ptlens" focal="88" a="0" b="0.010958" c="0" />
            <distortion model="ptlens" focal="144" a="0" b="0.008752" c="0" />
            <distortion model="ptlens" focal="200" a="0" b="0.00739" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 18-200mm f/3.5-6.3 II DC OS HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="18" a="0.02199" b="-0.06697" c="0.0302"/>
            <distortion model="ptlens" focal="29" a="0.02095" b="-0.05013" c="0.03415"/>
            <distortion model="ptlens" focal="33" a="0.00943" b="-0.01445" c="0.01804"/>
            <distortion model="ptlens" focal="45" a="0.01436" b="-0.02979" c="0.03583"/>
            <distortion model="ptlens" focal="73" a="0.00248" b="0.00171" c="0.00877"/>
            <distortion model="ptlens" focal="120" a="0.00678" b="-0.0146" c="0.0234"/>
            <distortion model="ptlens" focal="200" a="-0.00193" b="0.01252" c="-0.00228"/>
            <tca model="poly3" focal="18" br="0.0001235" vr="1.0001382" bb="-0.0000306" vb="1.0001851"/>
            <tca model="poly3" focal="29" br="-0.0000458" vr="1.0002713" bb="-0.0000635" vb="1.0003369"/>
            <tca model="poly3" focal="33" br="-0.0000240" vr="1.0001460" bb="-0.0000599" vb="1.0002709"/>
            <tca model="poly3" focal="45" br="-0.0000169" vr="1.0000713" bb="-0.0000694" vb="1.0003373"/>
            <tca model="poly3" focal="53" br="-0.0000118" vr="1.0000223" bb="-0.0000930" vb="1.0003137"/>
            <tca model="poly3" focal="73" br="-0.0000214" vr="0.9998926" bb="0.0001173" vb="1.0003260"/>
            <tca model="poly3" focal="120" br="-0.0001589" vr="0.9997609" bb="0.0001706" vb="1.0003043"/>
            <tca model="poly3" focal="200" br="-0.0002666" vr="0.9997012" bb="0.0002502" vb="1.0001707"/>
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 24-70mm f/2.8 EX DG Macro</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="24" a="0" b="-0.006096" c="0" />
            <distortion model="ptlens" focal="30" a="0" b="-0.001546" c="0" />
            <distortion model="ptlens" focal="36" a="0" b="0.001392" c="0" />
            <distortion model="ptlens" focal="42" a="0" b="0.002318" c="0" />
            <distortion model="ptlens" focal="52" a="0" b="0.003994" c="0" />
            <distortion model="ptlens" focal="64" a="0" b="0.004329" c="0" />
            <distortion model="ptlens" focal="70" a="0" b="0.006728" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 28-70mm f/2.8 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="28" a="0.01508" b="-0.036446" c="0" />
            <distortion model="ptlens" focal="30" a="0.01328" b="-0.02956" c="0" />
            <distortion model="ptlens" focal="34" a="0.001964" b="-0.003604" c="0" />
            <distortion model="ptlens" focal="40" a="0.006628" b="-0.009598" c="0" />
            <distortion model="ptlens" focal="45" a="0.004477" b="-0.003544" c="0" />
            <distortion model="ptlens" focal="50" a="0" b="0.006595" c="0" />
            <distortion model="ptlens" focal="60" a="0" b="0.0078" c="0" />
            <distortion model="ptlens" focal="70" a="0" b="0.008656" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 28-300mm f/3.5-6.3 Macro ASP IF</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="28" a="0" b="-0.009837" c="-0.008234" />
            <distortion model="ptlens" focal="34" a="0" b="-0.004678" c="0.000517" />
            <distortion model="ptlens" focal="55" a="0" b="0.005687" c="-0.005159" />
            <distortion model="ptlens" focal="75" a="0" b="0.008223" c="-0.004279" />
            <distortion model="ptlens" focal="100" a="0" b="0.005137" c="0.00146" />
            <distortion model="ptlens" focal="135" a="0" b="0.00675" c="-0.000965" />
            <distortion model="ptlens" focal="200" a="0" b="0.007188" c="-0.003544" />
            <distortion model="ptlens" focal="300" a="0" b="0.00471" c="8.5e-05" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 50-500mm f/4-6.3 EX DG HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="50" a="0" b="-0.00059" c="0" />
            <distortion model="ptlens" focal="72" a="0" b="0.004149" c="0" />
            <distortion model="ptlens" focal="100" a="0" b="0.005115" c="0" />
            <distortion model="ptlens" focal="135" a="0" b="0.005001" c="0" />
            <distortion model="ptlens" focal="195" a="0" b="0.004957" c="0" />
            <distortion model="ptlens" focal="270" a="0" b="0.004639" c="0" />
            <distortion model="ptlens" focal="320" a="0" b="0.005982" c="0" />
            <distortion model="ptlens" focal="420" a="0" b="0.005397" c="0" />
            <distortion model="ptlens" focal="500" a="0" b="0.004857" c="0" />
        </calibration>
    </lens>
    
    <lens>
        <maker>Sigma</maker>
        <model>Sigma 50-500mm F/4.5-6.3 DG OS HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>Sony Alpha</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="50" a="0" b="-0.00525" c="0" />
            <distortion model="ptlens" focal="78" a="0" b="0.00114" c="0" />
            <distortion model="ptlens" focal="95" a="0" b="0.00552" c="0" />
            <distortion model="ptlens" focal="140" a="0" b="0.0067" c="0" />
            <distortion model="ptlens" focal="210" a="0" b="0.00701" c="0" />
            <distortion model="ptlens" focal="290" a="0" b="0.00686" c="0" />
            <distortion model="ptlens" focal="420" a="0" b="0.00731" c="0" />
            <distortion model="ptlens" focal="500" a="0" b="0.00766" c="0" />
        </calibration>
    </lens>    

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 55-200mm f/4-5.6 DC</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="55" a="0" b="-0.004366" c="0" />
            <distortion model="ptlens" focal="59" a="0" b="-0.002076" c="0" />
            <distortion model="ptlens" focal="67" a="0" b="0.000422" c="0" />
            <distortion model="ptlens" focal="72" a="0" b="0.002204" c="0" />
            <distortion model="ptlens" focal="78" a="0" b="0.004926" c="0" />
            <distortion model="ptlens" focal="94" a="0" b="0.0063" c="0" />
            <distortion model="ptlens" focal="112" a="0" b="0.007639" c="0" />
            <distortion model="ptlens" focal="147" a="0" b="0.007139" c="0" />
            <distortion model="ptlens" focal="200" a="0" b="0.008176" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 70-300mm f/4-5.6 APO Macro Super II</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="70" a="0.002522" b="-0.005913" c="0" />
            <distortion model="ptlens" focal="81" a="-0.000431" b="0.003404" c="0" />
            <distortion model="ptlens" focal="92" a="-0.001379" b="0.006159" c="0" />
            <distortion model="ptlens" focal="100" a="-0.001226" b="0.006912" c="0" />
            <distortion model="ptlens" focal="119" a="0.001445" b="0.002936" c="0" />
            <distortion model="ptlens" focal="133" a="0.000359" b="0.005212" c="0" />
            <distortion model="ptlens" focal="149" a="0.000193" b="0.005672" c="0" />
            <distortion model="ptlens" focal="168" a="0.000533" b="0.005172" c="0" />
            <distortion model="ptlens" focal="190" a="0.000317" b="0.005522" c="0" />
            <distortion model="ptlens" focal="214" a="-4.9e-05" b="0.005661" c="0" />
            <distortion model="ptlens" focal="238" a="-0.000247" b="0.005706" c="0" />
            <distortion model="ptlens" focal="263" a="0.000491" b="0.003667" c="0" />
            <distortion model="ptlens" focal="300" a="0.001061" b="0.001597" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 70-300mm F4-5.6 DL Macro</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="70" a="-0.00291" b="0.00834" c="-0.00971" />
            <distortion model="ptlens" focal="100" a="-0.00296" b="0.0116" c="-0.00449" />
            <distortion model="ptlens" focal="135" a="-0.0029" b="0.01687" c="-0.01545" />
            <distortion model="ptlens" focal="200" a="-0.00219" b="0.01513" c="-0.01147" />
            <distortion model="ptlens" focal="300" a="-0.00382" b="0.02103" c="-0.01538" />
            <vignetting model="pa" focal="70" aperture="4" distance="10" k1="-0.5339" k2="0.2603" k3="-0.0804" />
            <vignetting model="pa" focal="70" aperture="4" distance="1000" k1="-0.5339" k2="0.2603" k3="-0.0804" />
            <vignetting model="pa" focal="70" aperture="5" distance="10" k1="-0.1134" k2="-0.0711" k3="-0.0220" />
            <vignetting model="pa" focal="70" aperture="5" distance="1000" k1="-0.1134" k2="-0.0711" k3="-0.0220" />
            <vignetting model="pa" focal="70" aperture="6.3" distance="10" k1="-0.2059" k2="0.1615" k3="-0.1053" />
            <vignetting model="pa" focal="70" aperture="6.3" distance="1000" k1="-0.2059" k2="0.1615" k3="-0.1053" />
            <vignetting model="pa" focal="70" aperture="8" distance="10" k1="-0.2160" k2="0.1671" k3="-0.1054" />
            <vignetting model="pa" focal="70" aperture="8" distance="1000" k1="-0.2160" k2="0.1671" k3="-0.1054" />
            <vignetting model="pa" focal="70" aperture="10" distance="10" k1="-0.2393" k2="0.2034" k3="-0.1265" />
            <vignetting model="pa" focal="70" aperture="10" distance="1000" k1="-0.2393" k2="0.2034" k3="-0.1265" />
            <vignetting model="pa" focal="70" aperture="22" distance="10" k1="-0.2449" k2="0.2257" k3="-0.1361" />
            <vignetting model="pa" focal="70" aperture="22" distance="1000" k1="-0.2449" k2="0.2257" k3="-0.1361" />
            <vignetting model="pa" focal="100" aperture="4" distance="10" k1="-0.5418" k2="0.2964" k3="-0.0942" />
            <vignetting model="pa" focal="100" aperture="4" distance="1000" k1="-0.5418" k2="0.2964" k3="-0.0942" />
            <vignetting model="pa" focal="100" aperture="5" distance="10" k1="-0.1245" k2="-0.2661" k3="0.1532" />
            <vignetting model="pa" focal="100" aperture="5" distance="1000" k1="-0.1245" k2="-0.2661" k3="0.1532" />
            <vignetting model="pa" focal="100" aperture="6.3" distance="10" k1="-0.1789" k2="0.1612" k3="-0.1008" />
            <vignetting model="pa" focal="100" aperture="6.3" distance="1000" k1="-0.1789" k2="0.1612" k3="-0.1008" />
            <vignetting model="pa" focal="100" aperture="8" distance="10" k1="-0.1974" k2="0.1709" k3="-0.0983" />
            <vignetting model="pa" focal="100" aperture="8" distance="1000" k1="-0.1974" k2="0.1709" k3="-0.0983" />
            <vignetting model="pa" focal="100" aperture="22" distance="10" k1="-0.2196" k2="0.2274" k3="-0.1269" />
            <vignetting model="pa" focal="100" aperture="22" distance="1000" k1="-0.2196" k2="0.2274" k3="-0.1269" />
            <vignetting model="pa" focal="135" aperture="4.5" distance="10" k1="-0.5472" k2="0.4149" k3="-0.1968" />
            <vignetting model="pa" focal="135" aperture="4.5" distance="1000" k1="-0.5472" k2="0.4149" k3="-0.1968" />
            <vignetting model="pa" focal="135" aperture="5.6" distance="10" k1="-0.1663" k2="0.2056" k3="-0.1957" />
            <vignetting model="pa" focal="135" aperture="5.6" distance="1000" k1="-0.1663" k2="0.2056" k3="-0.1957" />
            <vignetting model="pa" focal="135" aperture="7.1" distance="10" k1="-0.1665" k2="0.1322" k3="-0.0744" />
            <vignetting model="pa" focal="135" aperture="7.1" distance="1000" k1="-0.1665" k2="0.1322" k3="-0.0744" />
            <vignetting model="pa" focal="135" aperture="9" distance="10" k1="-0.1736" k2="0.1411" k3="-0.0754" />
            <vignetting model="pa" focal="135" aperture="9" distance="1000" k1="-0.1736" k2="0.1411" k3="-0.0754" />
            <vignetting model="pa" focal="135" aperture="22" distance="10" k1="-0.2012" k2="0.1940" k3="-0.0998" />
            <vignetting model="pa" focal="135" aperture="22" distance="1000" k1="-0.2012" k2="0.1940" k3="-0.0998" />
            <vignetting model="pa" focal="200" aperture="5" distance="10" k1="-0.4230" k2="0.0406" k3="0.0298" />
            <vignetting model="pa" focal="200" aperture="5" distance="1000" k1="-0.4230" k2="0.0406" k3="0.0298" />
            <vignetting model="pa" focal="200" aperture="6.3" distance="10" k1="-0.0624" k2="-0.0794" k3="-0.0365" />
            <vignetting model="pa" focal="200" aperture="6.3" distance="1000" k1="-0.0624" k2="-0.0794" k3="-0.0365" />
            <vignetting model="pa" focal="200" aperture="8" distance="10" k1="-0.1161" k2="0.0689" k3="-0.0492" />
            <vignetting model="pa" focal="200" aperture="8" distance="1000" k1="-0.1161" k2="0.0689" k3="-0.0492" />
            <vignetting model="pa" focal="200" aperture="10" distance="10" k1="-0.1115" k2="0.0722" k3="-0.0388" />
            <vignetting model="pa" focal="200" aperture="10" distance="1000" k1="-0.1115" k2="0.0722" k3="-0.0388" />
            <vignetting model="pa" focal="200" aperture="13" distance="10" k1="-0.1098" k2="0.0615" k3="-0.0289" />
            <vignetting model="pa" focal="200" aperture="13" distance="1000" k1="-0.1098" k2="0.0615" k3="-0.0289" />
            <vignetting model="pa" focal="200" aperture="25" distance="10" k1="-0.1194" k2="0.0752" k3="-0.0242" />
            <vignetting model="pa" focal="200" aperture="25" distance="1000" k1="-0.1194" k2="0.0752" k3="-0.0242" />
            <vignetting model="pa" focal="300" aperture="5.6" distance="10" k1="-0.7348" k2="0.6441" k3="-0.2653" />
            <vignetting model="pa" focal="300" aperture="5.6" distance="1000" k1="-0.7348" k2="0.6441" k3="-0.2653" />
            <vignetting model="pa" focal="300" aperture="7.1" distance="10" k1="-0.0752" k2="-0.3913" k3="0.2445" />
            <vignetting model="pa" focal="300" aperture="7.1" distance="1000" k1="-0.0752" k2="-0.3913" k3="0.2445" />
            <vignetting model="pa" focal="300" aperture="9" distance="10" k1="-0.0770" k2="0.0718" k3="-0.0707" />
            <vignetting model="pa" focal="300" aperture="9" distance="1000" k1="-0.0770" k2="0.0718" k3="-0.0707" />
            <vignetting model="pa" focal="300" aperture="11" distance="10" k1="-0.0799" k2="0.0542" k3="-0.0297" />
            <vignetting model="pa" focal="300" aperture="11" distance="1000" k1="-0.0799" k2="0.0542" k3="-0.0297" />
            <vignetting model="pa" focal="300" aperture="14" distance="10" k1="-0.0885" k2="0.0597" k3="-0.0282" />
            <vignetting model="pa" focal="300" aperture="14" distance="1000" k1="-0.0885" k2="0.0597" k3="-0.0282" />
            <vignetting model="pa" focal="300" aperture="32" distance="10" k1="-0.0889" k2="0.0432" k3="0.0027" />
            <vignetting model="pa" focal="300" aperture="32" distance="1000" k1="-0.0889" k2="0.0432" k3="0.0027" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 14mm f/2.8 EX</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="14" a="0.031106" b="-0.059086" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 14mm f/3.5 EX</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="14" a="0.013209" b="-0.036529" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 20mm f/1.8 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="20" a="0.034347" b="-0.066549" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 28mm f/1.8 EX DG</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="28" a="0.002854" b="-0.010067" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 30mm f/1.4 EX DC HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Minolta AF</mount>
        <mount>Nikon F AF</mount>
        <mount>Pentax KAF</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="30" a="0.003926" b="-0.013819" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 50mm f/1.4 EX DG HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Sony Alpha</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="50" a="-0.008" b="0.012" c="-0.002" />
        </calibration>
    </lens>

    <lens>
        <maker>Sigma</maker>
        <model>Sigma 50mm F1.4 EX DG HSM</model>
        <mount>Sigma SA</mount>
        <mount>Canon EF</mount>
        <mount>Nikon F AF</mount>
        <mount>Sony Alpha</mount>
        <mount>4/3 System</mount>
        <cropfactor>1.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="50" a="0.00055" b="-0.00799" c="0.00993" />
            <vignetting model="pa" focal="50" aperture="1.4" distance="10" k1="-0.5491" k2="0.2293" k3="-0.0540" />
            <vignetting model="pa" focal="50" aperture="1.4" distance="1000" k1="-0.5491" k2="0.2293" k3="-0.0540" />
            <vignetting model="pa" focal="50" aperture="1.7" distance="10" k1="-0.0950" k2="-0.3674" k3="0.1974" />
            <vignetting model="pa" focal="50" aperture="1.7" distance="1000" k1="-0.0950" k2="-0.3674" k3="0.1974" />
            <vignetting model="pa" focal="50" aperture="2.2" distance="10" k1="-0.1370" k2="0.0074" k3="0.0052" />
            <vignetting model="pa" focal="50" aperture="2.2" distance="1000" k1="-0.1370" k2="0.0074" k3="0.0052" />
            <vignetting model="pa" focal="50" aperture="2.8" distance="10" k1="-0.1324" k2="-0.0046" k3="0.0190" />
            <vignetting model="pa" focal="50" aperture="2.8" distance="1000" k1="-0.1324" k2="-0.0046" k3="0.0190" />
            <vignetting model="pa" focal="50" aperture="3.5" distance="10" k1="-0.1303" k2="-0.0097" k3="0.0256" />
            <vignetting model="pa" focal="50" aperture="3.5" distance="1000" k1="-0.1303" k2="-0.0097" k3="0.0256" />
            <vignetting model="pa" focal="50" aperture="16" distance="10" k1="-0.1414" k2="0.0090" k3="0.0253" />
            <vignetting model="pa" focal="50" aperture="16" distance="1000" k1="-0.1414" k2="0.0090" k3="0.0253" />
        </calibration>
    </lens>

</lensdatabase>
