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<strong>Super telephoto patent</strong>
A new Canon patent showing other lens formulas using a built-in 1.4x teleconverter. Two of the primary lenses are an EF 300-600 f/5.6L IS 1.4x and a 600 f/4L IS with a built in TC.</p>
<p>The same patent also shows the <a href="http://www.bhphotovideo.com/c/product/973129-REG/canon_5176b002_ef_200_400mm_f_4l_is.html/bi/2466/kbid/3296" target="_blank">EF 200-400 f/4L IS 1.4x TC</a>. Perhaps Canon sees value in this setup for longer lenses? Here’s hoping so.</p>
<p><strong>Example 2</strong></p>
<ul>
<li>Focal length f = 585.10mm</li>
<li>Fno. 4.12</li>
<li>Half angle ω = 2.12 °</li>
<li>Image height Y = 21.64mm</li>
<li>The overall length of the lens 467.32mm</li>
<li>BF 83.15mm</li>
<li>Teleconference insertion</li>
<li>Focal length f = 819.00mm</li>
<li>Fno. 5.77</li>
<li>Half angle ω = 1.51 °</li>
</ul>
<p><strong>Example 3</strong></p>
<ul>
<li>Zoom ratio 1.90</li>
<li>Focal length f = 307.50 – 585.00mm</li>
<li>Fno. 5.88</li>
<li>Half angle ω = 4.02 – 2.12 °</li>
<li>Image height Y = 21.64mm</li>
<li>The overall length of the lens 405.00mm</li>
<li>BF 75.70mm</li>
<li>Teleconference insertion</li>
<li>Focal length f = 427.00 – 812.33mm</li>
<li>Fno. 8.17</li>
<li>Half angle ω = 2.90 – 1.53 °</li>
</ul>
<p><strong>Source: [<a href="http://egami.blog.so-net.ne.jp/2013-12-06" target="_blank">EG</a>]</strong></p>
<p><strong><span style="color: #ff0000;">c</span>r</strong></p>
:'(
