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We’ve heard some chatter that Canon would continue to develop it’s non-L zoom lenses for full frame camera lineup and this patent for an EF 17-35mm f/4-5.6 IS would seem to fit into that segment.</p>
<p><a href="https://www.canonnews.com/canon-patents-a-17-35-is-4-56">Canon News</a>, a new leader in patent tracking found this one.</p>
<p><strong>Canon EF 17-35mm f/4-5.6 IS STM Optical Formula</strong></p>
<ul>
<li><strong>Focal distance:</strong> 17.50 25.12 34.09</li>
<li><strong>F number:</strong> 4.00 4.85 5.88</li>
<li><strong>A half field angle (degree):</strong> 51.03 40.73 32.40</li>
<li><strong>Image height:</strong> 21.64 21.64 21.64</li>
<li><strong>Whole length of the lens:</strong> 130.88 128.52 134.05</li>
<li><strong>BF:</strong> 37.60 49.75 64.06</li>
</ul>
<p><em>Japan patent application 2017-161568</em></p>
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