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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>

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<strong>A look inside the Rebel T4i</strong>


The folks at Chipworks have torn apart a Canon EOS Rebel T4i/650D to take a look inside. There’s some good explanation about phase detection autofocus as well as a list of the manufacturers used inside the camera.</p>
<p><strong>About Phase Detection Autofocus</strong></p>
<blockquote><p>Phase detection is where there are pairs of sensors that are blocked left and right (or top and bottom) and from the differences, the camera has the information needed to bring the image into focus. Please remember that teardown articles are generally focused on preliminary analysis because that is all we have at the time of publication (our Technology Blog focuses more on hard facts about the chips). With that in mind, we can see that unlike the Aptina sensor Canon is using a somewhat irregular pixel pattern for phase detection versus Aptina that used a set of regular lines. Our full report will include key information like SEM and bevel analysis to show the implementation in more detail and at higher magnification.</p></blockquote>
<p><strong><a href="http://www.chipworks.com/en/technical-competitive-analysis/resources/recent-teardowns/2012/07/inside-the-canon-rebel-t4i-dslr/" target="_blank">Read the entire article</a></strong></p>
<p><strong></strong><strong><span style="color: #ff0000;">c</span>r</strong></p>

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<strong>A new 50?


</strong>A purported replacement to the EF 50 f/1.4 was mentioned today in the form of an EF 50 f/1.8 IS. The lens would be smaller than the current 50 f/1.4. There is no imminent announcement of such a lens, but Canon is working to replace the 50 f/1.4 sometime in the next year. The current 50 f/1.8 would remain in the lineup.</p>
<p><strong>CR’s Take</strong>


There’s no doubt in my mind Canon is working on a couple of new 50mm lenses. With IS added to the new 24 & 28mm primes, IS in a 50 shouldn’t surprise anyone. It would be a welcomed lens if they can make it small enough to work well on a mirrorless platform.</p>
<p>Take this one with a grain of salt….</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>

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<strong>EF-S 18-135 IS STM Delay?</strong>


We’ve received a couple of reports from readers that their orders for the Rebel T4i w/18-135 IS STM kit have been cancelled without much reason given. One of the retailers cancelling the preorder was Amazon.</p>
<p>We’re waiting to hear some clarification on the matter. If your order has been cancelled, please let us know.</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>