Canon EF-S 10-22mm f/3.5-4.5 USM Lens [Alex Forencich]

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====== Canon EF-S 10-22mm f/3.5-4.5 USM Lens ======

{{:en:photo:equipment:canon-10-22mm.jpg?400&direct|}}

===== LensFun Calibration Data =====

This is my [[http://lensfun.berlios.de/|LensFun]] entry for this lens.  The distortion values listed are the default values that are included with the library.  Unfortunately, following the [[http://lensfun.berlios.de/lens-calibration/lens-calibration.html|lens calibration guide]], I was unable to get ''tca_correct'' to output anything meaningful.  Most of the values were far off the scale that ufraw could deal with (ufraw/lensfun wants +/- 0.01 but I was geting +/- 0.5 or more).  I just ended up manually selecting values for first order correction, producing a much better result than I could get from ''tca_correct''.  

<code>
    <lens>
        <maker>Canon</maker>
        <model>Canon EF-S 10-22mm f/3.5-4.5 USM</model>
        <mount>Canon EF-S</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="10" a="0.005371" b="-0.018303" c="0" />
            <distortion model="ptlens" focal="12" a="0.002619" b="-0.009527" c="0" />
            <distortion model="ptlens" focal="14" a="0.002896" b="-0.00705" c="0" />
            <distortion model="ptlens" focal="17" a="0.005115" b="-0.010326" c="0" />
            <distortion model="ptlens" focal="20" a="0.00512" b="-0.008414" c="0" />
            <distortion model="ptlens" focal="22" a="0.002769" b="-0.004058" c="0" />
            <!-- manually selected compensation values -->
            <tca model="linear" focal="10" kr="1.000300" kb="1.000700" />
            <tca model="linear" focal="12" kr="1.000200" kb="1.000600" />
            <tca model="linear" focal="14" kr="1.000200" kb="1.000600" />
            <tca model="linear" focal="17" kr="1.000200" kb="1.000500" />
            <tca model="linear" focal="20" kr="1.000200" kb="1.000400" />
            <tca model="linear" focal="22" kr="1.000200" kb="1.000400" />
        </calibration>
    </lens>
</code>

===== Links =====

  * [[wp>Canon EF-S 10-22mm lens]]
  * [[http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup/ef_s_10_22mm_f_3_5_4_5_usm|canon.com: Canon EF-S 10-22mm f/3.5-4.5 USM]]