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<p><strong>New fast primes</strong>
The often talked about 50 f/1.4 and 135 f/2 have appeared in a new patent this week. We’ve heard that a replacement to the 50 f/1.4 would come first. A new 135 f/2L is a desired lens if they put IS into the upgrade. We’ve also heard a new 85 f/1.2L with reduced weight and approved AF performance was also on the horizon.</p>
<ul>
<li>Patent Publication No. 2013-114133 (Google Translated)
<ul>
<li>Publication date 2013.6.10</li>
<li>Filing date 2011.11.30</li>
</ul>
</li>
</ul>
<table summary="embodiment" frame="box" rules="all">
<thead>
<tr>
<th></th>
<th>Focal length</th>
<th>Fno.</th>
<th>The overall length of the lens</th>
<th>BF</th>
<th>Lens constitution</th>
</tr>
</thead>
<tbody>
<tr>
<td>One</td>
<td>85.00</td>
<td>1.24</td>
<td>122.56</td>
<td>38.35</td>
<td>10 pieces of six groups</td>
</tr>
<tr>
<td>Two</td>
<td>83.30</td>
<td>1.80</td>
<td>116.11</td>
<td>39.11</td>
<td>10 sheets in 7 groups</td>
</tr>
<tr>
<td>Three</td>
<td>132.30</td>
<td>2.06</td>
<td>162.67</td>
<td>43.23</td>
<td>10 sheets in 7 groups</td>
</tr>
<tr>
<td>Four</td>
<td>51.70</td>
<td>1.41</td>
<td>87.84</td>
<td>38.94</td>
<td>7 group nine</td>
</tr>
</tbody>
</table>
<ul>
<li>Factors that chromatic aberration of magnification chromatic aberration or axial chromatic aberration occurs
<ul>
<li>Reducing the total length</li>
<li>Focal length for a long time</li>
</ul>
</li>
<li>Glass material Abbe number 70-90, of 1.4-1.5 refractive index
<ul>
<li>Possible correction of axial chromatic aberration</li>
<li>Must increase a curvature, spherical aberration and curvature of field is generated</li>
</ul>
</li>
<li>Canon patent
<ul>
<li>I use a glass material having an anomalous partial dispersion of the predetermined</li>
<li>Consisting of organic and inorganic compound</li>
</ul>
</li>
</ul>
<p><strong>Source: [<a href="http://translate.google.com/translate?sl=auto&tl=en&u=http://egami.blog.so-net.ne.jp/2013-06-11">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
