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A patent showing an optional image stabilization unit that can be put into a lens without changing its focal length has been filed.</p>
<p><strong>Patent Publication No. 2015-28555 (Google Translated)</strong></p>
<ul>
<li>Published 2015.2.12</li>
<li>Filing date 2013.7.30</li>
</ul>
<p><strong>Example 1a (master lens only)</strong></p>
<ul>
<li>Focal length 392.50</li>
<li>F-number 2.92</li>
<li>Half angle of 3.16</li>
<li>Image height 21.64</li>
<li>Overall length of the lens 379.64</li>
<li>BF 41.57</li>
<li>Effective diameter of the front lens 135.72mm</li>
<li>Lens configuration 8 groups nine</li>
</ul>
<p><!--more--></p>
<p><strong>Example 1b (anti-vibration converter mounted state)</strong></p>
<ul>
<li>Focal length 392.50</li>
<li>F-number 2.92</li>
<li>Half angle of 3.16</li>
<li>Image height 21.64</li>
<li>Overall length of the lens 379.64</li>
<li>BF 41.56</li>
<li>Effective diameter of the front lens 135.72mm</li>
<li>Lens construction 12 groups 15 sheets</li>
</ul>
<p><strong>Canon patent</strong></p>
<ul>
<li>3-group configuration of positive and negative positive</li>
<li>Inner focus (the second group)</li>
<li>The anti-vibration converter can be inserted on the object side of the third group</li>
</ul>
<p>Source: [<a href="http://translate.google.com/translate?sl=auto&tl=en&u=http://egami.blog.so-net.ne.jp/2015-02-16" target="_blank">EG</a>] via [<a href="http://www.northlight-images.co.uk/Canon_new_lenses.html" target="_blank">NL</a>]</p>
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