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<p>A patent showing an EF-M 18-40 f/3.5-5.6 pancake has come to light. With this patent a bunch of other optical formulas also appear, such as an 18-55 pancake, 10-20, and a 9-18. We currently have an EF-M 11-22, which is probably rooted from the latter two optical formulas.</p>
<p>A zoom pancake would be a nice addition to the geographically fragmented and oddly marketed EOS M line.</p>
<ul>
<li><strong>Patent Publication No. 2014-6275</strong>
<ul>
<li><span>Publication date 2014.1.16</span></li>
<li><span>Filing date 2012.6.21</span></li>
</ul>
</li>
<li><strong>Example 7</strong>
<ul>
<li><span>Zoom ratio 3.00</span></li>
<li><span>Focal length f = 18.10-37.01-54.30mm</span></li>
<li><span>Fno. 4.20-6.20-8.20</span></li>
<li><span>Half angle ω = 36.92-20.17-14.06 °</span></li>
<li><span>Image height Y = 13.60mm</span></li>
<li><span>64.74-56.63-62.13mm lens length</span></li>
<li><span>BF 0.50mm</span></li>
</ul>
</li>
<li><strong>Canon patents</strong>
<ul>
<li><span>The possible vibration damping by the second lens group</span></li>
<li><span>Feeding whole, front focus, focusing, rear focusing, etc.</span></li>
</ul>
</li>
</ul>
<p>Source: [<a href="http://egami.blog.so-net.ne.jp/2014-01-20" target="_blank">EG</a>]</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>