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<strong>Canon EF 35 f/1.4L Patent
</strong>A new patent for a 35mm f/1.4 optical formula has appeared. This is the first to appear since 2011 in regards to an updated 35 f/1.4L. View the previous patent <a href="http://www.canonrumors.com/2011/05/patent-ef-35-f1-4l-ii/" target="_blank">here</a>.</p>
<div id="attachment_10549" class="wp-caption alignnone" style="width: 285px"><a href="http://www.canonrumors.com/wp-content/uploads/2012/07/patent3514.png"><img class="size-full wp-image-10549" title="patent3514" src="http://www.canonrumors.com/wp-content/uploads/2012/07/patent3514.png" alt="" width="275" height="163" /></a><p class="wp-caption-text">Canon EF 35 f/1.4L II?</p></div>
<p><strong>Patent Publication No. 2012-123155</strong></p>
<ul>
<li>2012.6.28 Release Date</li>
<li>2010.12.8 filing date</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>Focal length f = 34.73mm</li>
<li>Fno. 1.45</li>
<li>Half angle of 31.92 deg.</li>
<li>Image height 21.64mm</li>
<li>Length 128.11mm lens</li>
<li>38.48mm back focus</li>
<li>An effective diameter of 52.03mm lens</li>
<li>Effective diameter aperture 25.52mm</li>
<li>Lens Construction 12 elements in 9 groups sheet</li>
<li>2 2 aspherical surface</li>
<li>2 UD glass sheet</li>
</ul>
<p><strong>Retrofocus</strong></p>
<ul>
<li>And retro focus lens optical system focal length is shorter than the length of the optical system</li>
<li>Increasingly asymmetric refractive power arrangement must be strengthened a negative refractive power of the front group in particular</li>
<li>Coma aberration, astigmatism, spherical aberration occurs</li>
<li>Order to secure a back focus must be to increase the ratio retro</li>
</ul>
<p>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-07-02" target="_blank">EG</a>]</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
<p><strong> </strong></p>
