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<strong>Patent literature, self-interpretation and summary
</strong>A lot of diffractive optics patents have come about over the years, and we have yet to see a new product to join the 400 f/4 DO or 70-300 DO. Canon obviously sees value in the technology as they continue to research it.</p>
<p><strong>Patent Publication No. 2012-2999</strong></p>
<ul>
<li>2012.1.5 Release Date</li>
<li>Filing date 2010.6.16</li>
</ul>
<p><strong>Benefits of diffractive optical elements</strong></p>
<ul>
<li>Can simultaneously reduce the chromatic aberration correction and lens length</li>
<li>Perform light lens design</li>
<li>Canon’s patented</li>
<li>Type Tele Photo</li>
<li>The first lens group</li>
<li>Aspherical surface having a diffraction</li>
<li>Reduce the number of lighter</li>
<li>Spherical aberration is corrected by using a non-</li>
<li>The second lens group</li>
<li>Inner Focus</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-01-06">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
