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Tamron has filed a patent for a 100-400mm f/4.5-6.3 VC optical formula. Such a lens would likely be a smaller and cheaper competitor to the Canon EF 100-400mm f/4.5-5.6L IS II.</p>
<p>Patent Publication No. 2016-126295 (Google Translated)</p>
<ul>
<li>Published 2016.7.11</li>
<li>Filing date 2015.1.8</li>
<li>Focal length 103.00 247.29 389.05</li>
<li>Fno. 4.51 5.81 6.53</li>
<li>Half angle of 11.68 4.88 3.11</li>
<li>Positive and negative positive negative</li>
<li>Rear focus (Group 5)</li>
<li>Anti-vibration (third group)</li>
</ul>
<p>We haven’t heard much about Tamron’s plans for Photokina, but we do expect some major announcements from the company.</p>
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