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<strong>New lens patents
</strong>A new patent showing two lenses, the 135 f/2.8 and 180 f/3.5 has appeared. The interesting part of these patents is something called a apodization filter on the lenses. This improves the bokeh performance of the lenses.</p>
<div id="attachment_10635" class="wp-caption alignnone" style="width: 422px"><a href="http://www.canonrumors.com/wp-content/uploads/2012/07/135apo.png"><img class="size-full wp-image-10635" title="135apo" src="http://www.canonrumors.com/wp-content/uploads/2012/07/135apo.png" alt="" width="412" height="146" /></a><p class="wp-caption-text">EF 135 f/2.8</p></div>
<p>Could either of these lens patents translate into a new 135 f/2L or 180 f/3.5L Macro? Only time will tell.</p>
<p>Read more after the break…</p>
<p><!--more--></p>
<p><strong>Patent Publication No. 2012-128151</strong></p>
<ul>
<li>2012.7.5 Release Date</li>
<li>2010.12.15 filing date</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>137.2mm – f = 135.0 focal length</li>
<li>Fno 2.83 -. 3.90</li>
<li>9.1 deg half each painting.</li>
<li>Image height 21.60mm</li>
<li>186.7mm – 150.0 full-length lens</li>
<li>BF 47.4 – 80.7mm</li>
<li>Lens Construction 10 elements in 7 groups sheet</li>
<li>1 UD glass sheet</li>
<li>0.25 times the maximum magnification ratio</li>
</ul>
<p><strong>Example 6</strong></p>
<ul>
<li>179.1mm – f = 180.0 focal length</li>
<li>Fno 3.50 -. 4.00</li>
<li>6.9 deg half each painting.</li>
<li>Image height 21.60mm</li>
<li>218.0mm – 199.8 full-length lens</li>
<li>BF 70.0 – 89.8mm</li>
<li>Lens Construction 11 elements in 7 groups sheet</li>
<li>1 UD glass sheet</li>
<li>0.11 times the maximum magnification ratio</li>
</ul>
<p><strong>Appearance of (Bokeh) is important out of focus</strong></p>
<p><strong>Apodization filter</strong></p>
<ul>
<li>The periphery of the filter transmittance is reduced</li>
<li>Added to the luminous flux intensity distribution</li>
<li>Bokeh is beautiful and the outline of the</li>
</ul>
<p><strong>Apodization element variable</strong></p>
<ul>
<li>If the liquid of same refractive index as the shape of the interface, no variation occurs in aberration</li>
<li>To be the same refractive power of the two liquids, the Abbe number is difficult</li>
</ul>
<p><strong>Canon ‘s patented</strong></p>
<ul>
<li>Variable element shape</li>
<li>Voltage is applied, changing the shape of the interface</li>
<li>Obtain the effect of apodization</li>
<li>Varying refractive power, the Abbe number</li>
<li>To reduce the time variable aberrations of shape</li>
<li>By a twist of the material performed, to optimize the absorption coefficient, to suppress the generation of aberration to moderate the curvature of the interface</li>
<li>To reverse the two materials (such as liquid), the amount of chromatic aberration, do the negation</li>
<li>Suppress the two materials (such as liquid), refractive index, the difference between the Abbe number</li>
<li>The entire feeding (with floating)</li>
</ul>
<div>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-07-14" target="_blank">EG</a>]</div>
<div><strong><span style="color: #ff0000;">c</span>r</strong></div>
<p> </p>
even tho the L version is cheapish compared to some.
