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<strong>Canon EF 50mm f/1.8 IS</strong>
A patent has show up showcasing an EF 50 f/1.8 IS lens. Could this be the replacement to the 50 f/1.4? We had <a href="http://www.canonrumors.com/2012/12/canon-ef-50-f1-4-is-in-2013-cr2/" target="_blank">heard about this lens existing last year</a>. While some may desire a direct 1.4 replacement with IS, I think Canon may want some separation between the <a href="http://www.bhphotovideo.com/c/product/457680-USA/Canon_1257B002AA_Normal_EF_50mm_f_1_2L.html/bi/2466/kbid/3296" target="_blank">EF 50 f/1.2L</a> and the next 50 in the lineup. We’ve also heard of a new EF 50 f/1.2L design being tested.</p>
<p><strong>Patent Publication No. 2013-142782</strong></p>
<ul>
<li>Publication date 2013.7.22</li>
<li>Filing date 2012.1.11</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>Focal length f = 51.51mm</li>
<li>Fno. 1.85</li>
<li>Half angle ω = 22.78 °</li>
<li>Image height 21.64mm</li>
<li>The overall length of the lens 76.78mm</li>
<li>BF 37.84mm</li>
<li>8 pieces of 7 lens configuration</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2013-07-24" target="_blank">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>