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A patent showing the optical formula for a Sigma 70-200mm f/2.8 OS Sport lens has appeared.</p>
<p>Patent Publication No. 2016-75828</p>
<ul>
<li>Published 2016.5.12</li>
<li>Filing date 2014.10.8</li>
<li>Zoom ratio 2.67</li>
<li>Focal length 72.41 118.50 193.38</li>
<li>F-number 2.92 2.92 2.92</li>
<li>Full angle of view 2ω 33.58 20.51 12.56</li>
<li>The image height Y 21.63 21.63 21.63</li>
<li>The total lens length 250.00 250.00 250.00</li>
</ul>
<p>This lens along with a new 24-70mm f/2.8 OS Art have been long expected from Sigma.</p>
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