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An updated EF 800mm f/5.6L IS is a lens I figured we would have seen already, but here we are still waiting for an update. For the moment, owning an EF 600mm f/4L IS II and a 1.4 teleconverter outperforms the EF 800mm f/5.6L IS in most of the important ways.</p>
<p>It looks like Canon is continuing to work on a follow-up to the longest lens in the current EF lineup.</p>
<p><strong>Japan Patent Application 2018-087965</strong></p>
<ul>
<li>Focal distance 780.00</li>
<li>F number 5.80</li>
<li>A half field angle (degree) — 1.59</li>
<li>Image height 21.64 whole length of the lens 485.85</li>
<li>BF 128.77</li>
</ul>
<p>We’ve been told to expect new “big white lenses” some time in the next year, but we do not yet know which lenses in the lineup will see an update.</p>
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