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It looks like Tamron is going to be busy at Photokina this year with lens announcements. We now see a <a href="http://egami.blog.so-net.ne.jp/2016-07-22">70-200mm f/4 VC patent</a>, a lens that is likely to come to market.</p>
<p>Patent Publication No. 2016-126278 (Google Translated)</p>
<ul>
<li>Published 2016.7.11</li>
<li>Filing date 2015.1.8</li>
<li>Focal length 71.8092 109.9915 205.9615</li>
<li>F-number 4.0989 4.1033 4.1023</li>
<li>Half angle of 16.7567 10.8972 5.8621</li>
<li>Positive and negative positive positive and negative 5-group zoom</li>
<li>Inner zoom</li>
<li>Inner focus</li>
<li>Vibration control</li>
</ul>
<p>We’ve now seen patents for a <a href="http://www.canonrumors.com/patent-tamron-60mm-f2-8-vc/">60mm f/2.8 VC</a> and <a href="http://www.canonrumors.com/patent-tamron-100-400mm-f4-5-6-3-vc/">100-400mm f/4.5-6.3 VC</a> from Tamron in the last few weeks. I will note that in the patent for the 100-400 optical formula, there were also examples for a 150-600mm f/4.5-6.3 VC, the current lens starts at f/5.</p>
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