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<p><strong>For the EF 200-400 f/4L IS 1.4x
</strong>Canon has updated both the discontinued EOS-1D Mark IV and the EOS-1Ds Mark III to work correctly with the new EF 200-400 f/4L IS 1.4x lens that is about to hit stores.<strong>
</strong></p>
<p> </p>
<p><strong>Canon EOS 1D Mark IV</strong></p>
<ul>
<li>Version 1.1.3</li>
<li>Enables the center AF point to autofocus when the camera is used with the EF 200-400mm F4L USM Extender 1.4X lens and an Extender, whose combined maximum aperture is f/8.</li>
<li>Fixes a phenomenon in which abnormal images may result when continuous shooting mode is enabled and the image size is set to “RAW” or “RAW+JPEG.</li>
<li><strong><a href="http://www.usa.canon.com/cusa/support/professional/professional_cameras/eos_digital_slr_cameras/eos_1d_mark_iv#DriversAndSoftware" target="_blank">Download Here</a></strong></li>
</ul>
<p><strong>Canon EOS 1Ds Mark III
</strong></p>
<ul>
<li>Version 1.2.2</li>
<li>Enables the center AF point to autofocus when the camera is used with the EF 200-400mm F4L USM Extender 1.4X lens and an Extender, whose combined maximum aperture is f/8.</li>
<li><strong><a href="http://www.usa.canon.com/cusa/support/professional/professional_cameras/eos_digital_slr_cameras/eos_1ds_mark_iii#DriversAndSoftware" target="_blank">Download Here</a></strong></li>
</ul>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>