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<p>A patent showing a new ultra wide angle optical formula has appeared in the form of a 9-18mm f/3.5-4.5 STM. This could be a higher end version of the EF-M 11-22 f/4-4.5 IS STM.</p>
<p>Patent Publication No. 2016-54371 (Google Translated)</p>
<ul>
<li>Published 2016.4.14</li>
<li>Filing date 2014.9.3</li>
<li>Zoom ratio 1.90</li>
<li>Wide-angle intermediate telephoto</li>
<li>Focal length 9.22 14.05 17.50</li>
<li>F-number 3.39 4.04 4.63</li>
<li>Half angle of view (degrees) 53.07 44.12 37.91</li>
<li>Image height 12.27 13.63 13.63</li>
<li>Overall length of the lens 89.68 83.60 86.84</li>
<li>BF 14.22 15.78 16.00</li>
<li>Upon correction of the distortion, providing a constraint on stretching amount at each image height</li>
<li>Properly set the curve shape of the distortion aberration</li>
</ul>
<p>There definitely see to be a lot of EOS M patents and talk happening at the moment. We expect to see at least one higher end EOS M camera announced and delivered this year.</p>
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