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<strong>Update:</strong> <a href="https://www.canonnews.com/canon-applies-for-a-fisheye-lens-one-possible-mirrorless-prime-patent">Canon News has dug a bit further</a> and come to the conclusion that these optical formulas are for a fisheye due to the lenses having a 175 degree field of view.</p>
<p>A new patent showing an optical formula for a new wide angle prime has appeared. The full frame lens in the application is an EF 15mm f/4, while the APS-C optical formula of a EF-M 9.5mm f/4 shows a shorter backfocus than an EF-S lens and could actually be EF-M.</p>
<p><strong>Japan Patent Application <a href="https://www.canonnews.com/canon-applies-for-a-uwa-lens-one-possible-mirrorless-uwa-prime-patent">2018-004726</a></strong></p>
<p>Canon EF-M 9.5mm f/4</p>
<ul>
<li>Focal distance 9.50</li>
<li>F number 4.10</li>
<li>Imaging field angle (degree) 175</li>
<li>Image height 13.66</li>
<li>Whole length of the lens 63.97</li>
<li>BF 23.16</li>
</ul>
<p>Canon EF 15mm f/4</p>
<ul>
<li>Focal distance 15.18</li>
<li>F number 4.12</li>
<li>Imaging field angle (degree) 175</li>
<li>Image height 21.64</li>
<li>Whole length of the lens 130.16</li>
<li>BF 58.19</li>
</ul>
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