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<strong>We’ve seen a 600 DO patents before, no lens yet.</strong>
<a href="http://photorumors.com/2010/11/22/canon-files-a-patent-for-a-600mm-f5-6-lens/#more-7020">PR</a> shows us a patent for a 600 f/5.6 DO lens. (JPO 2010-145832)</p>
<p><img class="aligncenter size-medium wp-image-5451" title="canon-600mm-f5.6-lens-patent" src="http://www.canonrumors.com/wp-content/uploads/2010/11/canon-600mm-f5.6-lens-patent-300x191.gif" alt="" width="300" height="191" /></p>
<p>We’ve seen <a href="http://www.canonrumors.com/2009/12/lens-patents-everywhere/">patents for DO lenses before</a>. There are 300mm, 400m and 600mm DO patents.</p>
<p>Take a <a href="http://www.canonrumors.com/category/photography/canon-patents/">peak at some of the other lens patents</a> Canon has filed. There was even one for a Zoom fisheye, though it’s different than what actually reached market.</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong>