Patent: Tamron 70-200 f/2.8 VC

[Canon Rumors]

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<strong>Another new 70-200 f/2.8


</strong>It looks like Tamron is going to be refreshing their 70-200 f/2.8 with a new version. The new version will add Tamron’s vibration correction as well as a new optical design.</p>
<p><strong>2012-58619,2012-58620 Patent Publication No.</strong></p>
<ul>
<li>2012.3.22 Release Date</li>
<li>2010.9.10 filing date</li>
</ul>
<p><strong>Example 1</strong></p>
<ul>
<li>111.5353 – - 194.0928mm f = 71.5336 focal length</li>
<li>Fno 2.9</li>
<li>20.71 – - 12.48 deg 34.66 angle of view.</li>
<li>Magnification ratio 2.713</li>
<li>18 sheets 13 group lens configuration</li>
<li>Three three aspherical surface</li>
<li>3 ED glass sheet</li>
<li>Super ED lens equivalent to 1 XLD glass sheets and fluorite ※</li>
</ul>
<p><strong>Tamron’s patent</strong></p>
<ul>
<li>Positive-positive four-group zoom of positive and negative</li>
<li>Inner Focus</li>
<li>Focusing for the third lens group</li>
<li>Made compact and lightweight AF speed of the focus group</li>
<li>Lens consists of a single sheet of focus group</li>
<li>Inner zoom</li>
<li>Shake correction</li>
<li>For anti-vibration part of the fourth lens group</li>
<li>Compact, lightweight unit</li>
<li>By a small amount of shift in anti-vibration, energy saving</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2012-03-23" target="_blank">EG</a>]</strong></p>
<p><strong></strong><strong><span style="color: #ff0000;">c</span>r</strong></p>

 

[traveller]

No mnention of their new USD (ultrasonic) motor then? This is the biggest flaw of the existing design and one of the reasons why I traded mine in for the Canon version. Shame really, because the Tamron was optically superb, especially at the shorter end. I hope they don't ruin the optics with their VC implementation like they did with the 17-50mm.

 

[AJ]

No mnention of their new USD (ultrasonic) motor then? This is the biggest flaw of the existing design and one of the reasons why I traded mine in for the Canon version. Shame really, because the Tamron was optically superb, especially at the shorter end. I hope they don't ruin the optics with their VC implementation like they did with the 17-50mm.

It's a patent on optical design, not a product announcement.

If this lens is produced it will almost certainly feature a USD motor. It must, to compete with Canon Nikon and Sigma.

 

[stabmasterasron]

Great, can't wait to see how this turns out. I had the Tamron 17-50 VC, but sold it because the focus motor was just too slow. If they do make a product out of this patent, I sure hope it has the new USD motor. I see no reason why they would not put it in.