Canon EF 24-105mm f/4L IS USM Lens [Alex Forencich]

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====== Canon EF 24-105mm f/4L IS USM Lens ======

{{:en:photo:equipment:canon-24-105mm-f4-is.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''.  Values below only tested on camera with crop factor of 1.6.  

<code>
    <lens>
        <maker>Canon</maker>
        <model>Canon EF 24-105mm f/4L IS USM</model>
        <mount>Canon EF</mount>
        <cropfactor>1.0</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="24" a="0.017263" b="-0.049244" c="0" />
            <distortion model="ptlens" focal="28" a="0.010878" b="-0.024454" c="0" />
            <distortion model="ptlens" focal="35" a="0.007152" b="-0.009799" c="0" />
            <distortion model="ptlens" focal="50" a="0.002502" b="0.004803" c="0" />
            <distortion model="ptlens" focal="70" a="0" b="0.009685" c="0" />
            <distortion model="ptlens" focal="88" a="0" b="0.008781" c="0" />
            <distortion model="ptlens" focal="105" a="0" b="0.009598" c="0" />
            <!-- manually selected compensation values -->
            <tca model="linear" focal="24" kr="1.000300" kb="1.000300" />
            <tca model="linear" focal="28" kr="1.000400" kb="1.000300" />
            <tca model="linear" focal="35" kr="1.000400" kb="1.000300" />
            <tca model="linear" focal="50" kr="1.000100" kb="1.000100" />
            <tca model="linear" focal="70" kr="1.000000" kb="1.000000" />
            <tca model="linear" focal="88" kr="0.999900" kb="0.999800" />
            <tca model="linear" focal="105" kr="0.999800" kb="0.999800" />
        </calibration>
    </lens>

    <lens>
        <maker>Canon</maker>
        <model>Canon EF 24-105mm f/4L IS USM</model>
        <mount>Canon EF</mount>
        <cropfactor>1.6</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="24" a="0.00552" b="-0.02074" c="0" />
            <distortion model="ptlens" focal="28" a="0.00396" b="-0.01457" c="0" />
            <distortion model="ptlens" focal="35" a="0.00091" b="-0.00171" c="0" />
            <distortion model="ptlens" focal="50" a="0.00077" b="0.00096" c="0" />
            <distortion model="ptlens" focal="70" a="0.0016" b="5e-05" c="0" />
            <distortion model="ptlens" focal="88" a="0.00467" b="-0.00624" c="0" />
            <distortion model="ptlens" focal="105" a="0.00797" b="-0.01307" c="0" />
            <!-- manually selected compensation values -->
            <tca model="linear" focal="24" kr="1.000300" kb="1.000300" />
            <tca model="linear" focal="28" kr="1.000400" kb="1.000300" />
            <tca model="linear" focal="35" kr="1.000400" kb="1.000300" />
            <tca model="linear" focal="50" kr="1.000100" kb="1.000100" />
            <tca model="linear" focal="70" kr="1.000000" kb="1.000000" />
            <tca model="linear" focal="88" kr="0.999900" kb="0.999800" />
            <tca model="linear" focal="105" kr="0.999800" kb="0.999800" />
        </calibration>
    </lens>
</code>

===== Links =====

  * [[wp>Canon EF 24-105mm lens]]
  * [[http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup/ef_24_105mm_f_4l_is_usm|canon.com: Canon EF 24-105mm f/4L IS USM]]