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Canon has filed a patent <a href="https://www.canonnews.com/canon-patent-application-soft-focus-lenses">spotted by Canon News</a> for a variety of soft focus lenses. The most interesting of the bunch is a 70-200 f/4 full frame lens with a backfocus of 25mm, meaning it’s not an EF mount lens.</p>
<p><strong>35mm f/1.8 full frame EF Canon mount</strong></p>
<ul>
<li>Focal Length 33.75</li>
<li>F-Number 1.72</li>
<li>Image Height 21.64</li>
<li>Total Lens Length 132.93</li>
<li>BF 39.14</li>
</ul>
<p><strong>58mm f/1.4 full frame EF Canon mount</strong></p>
<ul>
<li>Focal Length 57.57</li>
<li>F-Number 1.43</li>
<li>Image Height 21.64</li>
<li>Total Lens Length 160.04</li>
<li>BF 40.43</li>
</ul>
<p><strong>105mm f/2.0 full frame EF Canon mount</strong></p>
<ul>
<li>Focal 103.2</li>
<li>F-Number 2.17</li>
<li>Image Height 21.64</li>
<li>Total Lens Length 123.79</li>
<li>BF 42.2</li>
</ul>
<p><strong>70-200 f/4 full frame BF of 25mm (not EF mount)</strong></p>
<ul>
<li>Focal 72.21 – 194.06</li>
<li>F-Number 4.00</li>
<li>Image Height: 21.64</li>
<li>BF 25.98</li>
</ul>
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