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<p>A patent for an EF 24-85 f/3.5-5.6 IS has appeared. Along with this lens is a patent for the EF 24-70 f/4L IS. I do think Canon does need a new full frame non-L zoom lens to go into less expensive kits, or for an even less expensive full frame camera down the road.</p>
<p><strong>Description and self-interpretation of the patent literature</strong></p>
<ul>
<li>Patent Publication No. 2014-16464,2014-16465
<ul>
<li>Publication date 2014.1.30</li>
<li>Filing date 2012.7.9</li>
</ul>
</li>
<li>Example 3
<ul>
<li>Macro when in parentheses</li>
<li>Zoom ratio 2.84 (2.87)</li>
<li>Focal length f = 24.30-35.10-69.00mm (67.23-60.62)</li>
<li>Fno. 4.10 (5.28-5.56)</li>
<li>Half angle ω = 41.68-31.65-17.41 ° (17.84-19.64)</li>
<li>Image height Y = 21.64mm</li>
<li>134.65-141.04-164.94mm overall length of the lens (162.09-152.75)</li>
<li>BF 39.15-46.02-59.68mm (64.95-67.73)</li>
<li>β = -0.17 (-0.7)</li>
</ul>
</li>
<li>Example 4
<ul>
<li>Macro when in parentheses</li>
<li>Zoom ratio 3.42 (2.84)</li>
<li>Focal length f = 24.30-35.10-82.99mm (68.22-64.03)</li>
<li>Fno. 3.58-4.42-5.89 (5.92-5.87)</li>
<li>Half angle ω = 41.68-31.65-14.61 ° (17.60-18.67)</li>
<li>Image height Y = 21.64mm</li>
<li>126.64-128.32-155.92mm overall length of the lens (149.57-148.58)</li>
<li>BF 39.39-49.31-64.14mm (65.59-65.96)</li>
<li>β = -0.17 (-0.6)</li>
</ul>
</li>
<li>Canon patents
<ul>
<li>(4, etc. as in Example 3) seven-group zoom of positive and negative positive and negative positive positive and negative</li>
<li>(4, etc. the second group, as in Example 3) inner focus</li>
<li>implement the macro function by the first group fed out to the object side</li>
</ul>
</li>
</ul>
<p>Source: [<a href="http://egami.blog.so-net.ne.jp/2014-02-10" target="_blank">EG</a>]</p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>