A Canon patent application shows what looks to be expanding on ASC (air sphere coating).

As you can see in the image below, ASC in fact looks like little bubbles

JP2017 167271 - Patent: A New Type of ASC Lens Coating

From Japan Patent Application: 2017-167271

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.

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