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<strong>You want IS?
</strong>A patent for an EF 24-70 f/2.8L IS has surfaced finally, this has been a lens that has been talked about and desired for a long time.</p>
<p>We mentioned <a href="http://www.canonrumors.com/2011/04/a-random-roadmap-lenses-body-cr1/" target="_blank">some time back that there were 5 or 6 version</a> of the new 24-70, and one of them had IS. Canon decided against an IS version for reasons to do with weight, size and cost from what I’m told.</p>
<p>Sadly for the ones that want an IS version of this lens, I have little faith that such a lens will be coming any time soon. Patents can sometimes appear after a product has been announced, and that’s probably what has happened here.</p>
<div id="attachment_10601" class="wp-caption alignnone" style="width: 325px"><a href="http://www.canonrumors.com/wp-content/uploads/2012/07/2470is.png"><img class="size-full wp-image-10601" title="2470is" src="http://www.canonrumors.com/wp-content/uploads/2012/07/2470is.png" alt="" width="315" height="178" /></a><p class="wp-caption-text">Canon EF 24-70 f/2.8L IS</p></div>
<p><strong>Patent Publication No. 2012-123156</strong></p>
<ul>
<li>2012.6.28 Release Date</li>
<li>2010.12.8 filing date</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>Zoom ratio 2.46</li>
<li>68.99mm – f = 28.00 focal length</li>
<li>Fno. 2.88</li>
<li>17.41 deg – 37.69 half angle of view.</li>
<li>Image height 21.64mm</li>
<li>222.38mm – 192.25 full-length lens</li>
<li>BF 39.98 – 53.68</li>
<li>Effective diameter 74.47mm ball before</li>
<li>Effective diameter aperture 31.23mm</li>
<li>19 sheets 12 group lens configuration</li>
<li>Three three aspherical surface</li>
<li>2 UD glass sheet</li>
</ul>
<p><strong>Example 2</strong></p>
<ul>
<li>Zoom ratio 2.86</li>
<li>68.70 – f = 24.00 focal length</li>
<li>Fno. 2.88</li>
<li>17.48 deg – 42.03 half angle of view.</li>
<li>Image height 21.64mm</li>
<li>224.86mm – 191.93 full-length lens</li>
<li>BF 39.85 – 55.68mm</li>
<li>Effective diameter 77.29mm ball before</li>
<li>Effective diameter aperture 32.58mm</li>
<li>Lens Construction 12 group 21 sheets</li>
<li>Three three aspherical surface</li>
<li>2 UD glass sheet</li>
<li>Five-group zoom positive and negative positive positive and negative</li>
<li>(For Focusing group 2) Inner Focus</li>
<li>(Part 1 of the fourth lens group, anti-vibration unit is L4a) image stabilization</li>
</ul>
<div>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-07-08" target="_blank">EG</a>]</div>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
but everyone else beat me to it, so I guess I have to think instead. 
