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This sort of lens could signal an improvement on entry level kit glass, as an optical formula for an EF-S 15-53mm f/2.8-4 has appeared.</p>
<p>Patent Publication No. 2015-152765 (Google Translated)</p>
<ul>
<li>Published 2015.8.24</li>
<li>Filing date 2014.2.14</li>
<li>Focal length 15.40 20.46 51.00mm</li>
<li>Fno 2.80 3.00 4.30</li>
<li>Half angle of view ω 41.57 33.73 14.99 °</li>
<li>Image height 13.66mm</li>
<li>Overall length of the lens 119.65 123.99 149.53mm</li>
<li>BF 35.93 38.66 50.56mm</li>
</ul>