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<strong>Canon EF/EF-S 55-110 f/2
</strong>A new patent showing off a unique zoon range and speed from Canon. Would indoor sports be the target market with such a lens?</p>
<p>It’s noted that this may be for APS-C cameras, therefore an EF-S lens. <em>(thanks Michael)</em></p>
<p><strong>Patent Publication No. 2012-8344</strong></p>
<ul>
<li>2012.1.12 Release Date</li>
<li>Filing date 2010.6.24</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>Focal length f = 55.5 – 112.2mm</li>
<li>Fno. = 2.0</li>
<li>2.0 zoom ratio</li>
<li>Half angle of 13.4181 – 6.712 deg.</li>
<li>Each group 18 Configuration 15</li>
<li>Inner Zoom</li>
<li>Group of the formula before feeding</li>
<li>Negative distortion that occurs in the front lens group and zooming to the telephoto side, causing a distortion in the positive side of the rear lens group is moved to the fifth group, the overall distortion suppressed .</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-01-20">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>