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<p><strong>More Patents</strong>
A couple of new lens formula patents which seems to address lowering chromatic aberrations in a new way</p>
<p><strong>Patent Publication No. 2012-163746</strong></p>
<ul>
<li>2012.8.30 Release Date</li>
<li>2011.2.7 filing date</li>
</ul>
<p><strong>Example 4</strong></p>
<ul>
<li>Zoom ratio 4.67</li>
<li>56.11 – - 131.85mm f = 28.21 focal length</li>
<li>Fno 4.12 -. 4.89 – 5.77</li>
<li>Half angle of view ω = 37.48 – 21.09 – 9.32deg.</li>
<li>Image height 21.64mm</li>
<li>242.67 – - 266.43mm 224.00 overall length of the lens</li>
<li>BF 55.79 – 70.40 – 82.95mm</li>
<li>20 sheets of 14 group lens configuration</li>
<li>Two two-sided aspherical</li>
<li>Three low-dispersion glass</li>
<li>Four Super UD glass</li>
<li>102.40mm effective diameter of the first surface</li>
<li>5-group zoom negative positive negative</li>
</ul>
<p><strong>Example 5</strong></p>
<ul>
<li>Zoom ratio 10.31</li>
<li>93.64 – - 307.06mm f = 29.77 focal length</li>
<li>Fno 3.31 -. 4.71 – 5.85</li>
<li>Half angle of view ω = 36.00 – 13.01 – 4.03deg.</li>
<li>Image height 21.64mm</li>
<li>263.66 – - 304.01mm 209.34 overall length of the lens</li>
<li>BF 61.72 – 89.40 – 106.84mm</li>
<li>18 sheets 12 groups lens configuration</li>
<li>Three 3 aspherical surface</li>
<li>Three low-dispersion glass</li>
<li>2 UD glass sheets</li>
<li>84.36mm effective diameter of the first surface</li>
<li>5-group zoom negative positive negative</li>
<li>In the zoom lens of the positive lead type, reducing the chromatic aberration of magnification of the secondary</li>
</ul>
<div><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-08-31" target="_blank">EG</a>]</strong></div>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
