Patent: Canon EF 400 f/4 DO IS

[Canon Rumors]

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<p>A patent for a new Canon EF 400 f/4 DO IS has appeared. The current lens has been <a href="http://www.canon.com/camera-museum/lens/ef/data/super_telephoto/ef_400_4dois_usm.html" target="_blank">around since December, 2001</a> and I think it’s a gem in the Canon lineup.</p>
<p>We’ve seen a lot of DO patents over the years, but no DO lens has been announced since June, 2004 when the <a href="http://www.bhphotovideo.com/c/product/319783-USA/Canon_9321A002_EF_70_300mm_f_4_5_5_6_DO.html/bi/2466/kbid/3296" target="_blank">EF 70-300 f/4.5-5.6 DO IS</a> came to market.</p>
<div id="attachment_16761" style="width: 469px" class="wp-caption alignnone"><a href="http://www.canonrumors.com/wp-content/uploads/2014/06/400dopatent.png"><img class="size-full wp-image-16761" src="http://www.canonrumors.com/wp-content/uploads/2014/06/400dopatent.png" alt="Canon EF 400 f/4 DO IS" width="459" height="186" /></a><p class="wp-caption-text">Canon EF 400 f/4 DO IS</p></div>
<ul style="color: #444444;">
<li>Patent Publication No. 2014-109700
<ul>
<li>Publication date 2014.6.12</li>
<li>Filing date 2012.12.3</li>
</ul>
</li>
<li>Example 1
<ul>
<li>Focal length f = 392.00-381.59-332.99mm</li>
<li>Fno.</li>
<li>Half angle ω = 3.16-3.10-2.81 °</li>
<li>Image height Y = 21.64mm</li>
<li>The overall length of the lens 292.02mm</li>
<li>BF 105.64mm</li>
</ul>
</li>
</ul>
<p>Source: [<a href="http://egami.blog.so-net.ne.jp/2014-06-21" target="_blank">EG</a>]<strong> | <a href="http://www.bhphotovideo.com/c/product/239654-USA/Canon_7034A002_Telephoto_EF_400mm_f_4_0.html/bi/2466/kbid/3296" target="_blank">Canon EF 400 f/4 DO IS at B&H Photo</a></strong></p>

 

[Loswr]

Looks like a fairly different optical forumla than the current one. I wonder what were the design goals? Lighter (no meniscus lens)? More contrast (the bane of the current DO lenses)?

 

[wickidwombat]

wow that looks intersting i wonder what it will sell for should they make it!

 

[tayassu]

If that patent is structured like all the other patents then this lens should be a 330-400mmish with no aperture? Is there something special with DO lenses? Or is there just a bug on my computer?