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<p><strong>Another patent
</strong>This is probably the third separate patent I have seen for an EF 100-400 f/4.5-5.6L IS over the last 24 months. A zoom ring version does exist in the wild. We’re told the push/pull is finished and we’ll get a properly sealed 100-400. The cost will be north of $2500 USD and we could finally see it announced before the end of the year. Also appearing in the patent is a 70-300.</p>
<p><strong>The breakdown below is Google translated</strong></p>
<ul>
<li><span>Patent Publication No. 2013-105053</span>
<ul>
<li><span>Publication date 2013.5.30</span></li>
<li><span>Filing date 2011.11.15</span></li>
</ul>
</li>
<li><span>Example 1</span>
<ul>
<li><span>Zoom ratio 4.01</span></li>
<li><span>Focal length f = 72.48-135.49-290.86mm</span></li>
<li><span>Fno. 4.58-4.94-5.85</span></li>
<li><span>Half angle ω = 16.62-9.07-4.25 °</span></li>
<li><span>Image height Y = 21.64mm</span></li>
<li><span>143.42-175.48-201.87mm overall length of the lens</span></li>
<li><span>BF 39.98mm</span></li>
</ul>
</li>
<li><span>Example 3</span>
<ul>
<li><span>Zoom ratio 3.75</span></li>
<li><span>Focal length f = 104.16-166.66-391.00mm</span></li>
<li><span>Fno. 4.60-5.20-5.80</span></li>
<li><span>Half angle ω = 11.73-7.40-3.17 °</span></li>
<li><span>Image height Y = 21.64mm</span></li>
<li><span>221.48-252.31-300.68mm overall length of the lens</span></li>
<li><span>BF 70.65-87.69-113.37mm</span></li>
</ul>
</li>
<li><span>Canon</span><span> patent</span>
<ul>
<li><span>I want to put in the first group the anomalous dispersion optical element</span></li>
<li><span>It is possible correction and lateral chromatic axial chromatic aberration, but spherical aberration of color and field curvature occurs</span></li>
<li><span>By optimizing the placement, the correction and field curvature, the spherical aberration of the color of g-line</span></li>
</ul>
</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2013-06-13" target="_blank">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
