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<p><strong>Patent for wide angle fluorite concepts
</strong>Canon has filed patent for a wide angle fluorite concept. Such a patent could be part of a new ultra-wide zoom lens, perhaps a 14-24 or a replacement to the 16-35. Egami also thinks it’s possible this patent could be for the EF-M mount. It’s an interesting read, even when Google translated. Read the <a href="http://egami.blog.so-net.ne.jp/2013-02-25" target="_blank">full patent here</a>.</p>
<ul>
<li><strong>Patent Publication No. 2013-37339</strong>
<ul>
<li><span>2013.2.21 Release Date</span></li>
<li><span>Filing date 2011.7.12</span></li>
</ul>
</li>
<li><strong>Example 1</strong>
<ul>
<li><span>Zoom ratio 1.00</span></li>
<li><span>Focal length f = 1.00mm</span></li>
<li><span>Fno. 2.90</span></li>
<li><span>Half angle of view ω = 56.66 °</span></li>
<li><span>Image height Y = 1.52mm</span></li>
<li><span>9.51mm length lens</span></li>
<li><span>BF 2.82mm</span></li>
<li><span>6 aspherical surfaces, the first surface 25</span></li>
<li><span>Punctually</span></li>
</ul>
</li>
<li><strong>Example 3</strong>
<ul>
<li><span>Zoom ratio 2.06</span></li>
<li><span>2.06mm – f = 1.00 focal length</span></li>
<li><span>Fno 2.79 -. 4.00</span></li>
<li><span>Half angle of view ω = 51.27 – 32.82 °</span></li>
<li><span>1.33mm – Y = 1.25 image height</span></li>
<li><span>8.55mm – 8.79 length lens</span></li>
<li><span>BF 2.41 – 3.46mm</span></li>
<li><span>Aspheric first surface, the fifth surface, the first surface 26</span></li>
<li><span>Positive and negative positive negative</span></li>
</ul>
</li>
<li><strong>Example 6</strong>
<ul>
<li><span>Zoom ratio 1.00</span></li>
<li><span>Focal length f = 1.00mm</span></li>
<li><span>Fno. 2.90</span></li>
<li><span>Half angle of view ω = 87.35 °</span></li>
<li><span>Image height Y = 21.60mm</span></li>
<li><span>9.51mm length lens</span></li>
<li><span>BF 2.82mm</span></li>
<li><span>6 aspherical surfaces, the first surface 25</span></li>
<li><span>Punctually</span></li>
</ul>
</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2013-02-25" target="_blank">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
