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A Canon patent application shows what looks to be expanding on ASC (air sphere coating).</p>
<p>As you can see in the image below, ASC in fact looks like little bubbles</p>
<p><img class="aligncenter size-full wp-image-32722" src="http://www.canonrumors.com/wp-content/uploads/2017/12/JP2017-167271.png" alt="" width="297" height="223" srcset="http://www.canonrumors.com/wp-content/uploads/2017/12/JP2017-167271.png 297w, http://www.canonrumors.com/wp-content/uploads/2017/12/JP2017-167271-225x169.png 225w" sizes="(max-width: 297px) 100vw, 297px" /></p>
<p>From <a href="https://www.canonnews.com/patent-application-for-new-lens-coating">Japan Patent Application</a>: 2017-167271</p>
<blockquote><p>To provide an optical member having an anti-reflection film with high strength, uniform refractive index distribution, and low scattering, and a manufacturing method for the optical member.</p></blockquote>
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