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Canon has released new firmware for the EF 200-400mm f/4L IS 1.4x.</p>
<p><strong>Changes in firmware</strong>
Firmware Version 1.1.0 is incorporated with the following correction.</p>
<ol>
<li>Corrects a phenomenon in which the subject may not be in focus on some occasions when using this lens with some camera models (*) and performing AF shooting from approximately 3m.</li>
</ol>
<p>* Some camera models:
EOS-1D X, Mark II, EOS-1D X, EOS-1D C, EOS 5Ds, EOS 5Ds R, EOS 5D Mark IV, EOS 5D Mark III</p>
<p>Firmware Version 1.1.0 is for lenses with Firmware Version 1.0.0. If the lens’ firmware is already Version 1.1.0, it is not necessary to update the firmware.</p>
<p><strong><a href="https://www.usa.canon.com/internet/portal/us/home/support/details/lenses/ef/super-telephoto/ef-200-400mm-f-4l-is-usm-extender-1-4x?subtab=downloads-firmware">Download firmware v1.1.0 for the Canon EF 200-400mm f/4L IS 1.4x</a></strong></p>
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