Nano surface coating
Nano surface coating is a Panasonic brand for its latest lens anti-reflective coating technology.
According to Panasonic literature:
Panasonic's Nano Surface Coating technology is adopted to minimise the reflection at entire visual light range (380nm-780nm) by applying the extra-low refractive index coating with nano-sized structure on the surface of the lens. It results in the super clear picture with dramatic reduction of ghost and flare.
From this we can deduce that Panasonic has developed a lens coating system that enables extremely thin layers of material to be deposited on the lens surfaces. The thickness of these layers can then be designed to absorb and eliminate unwanted internal reflections more effectively and across a wider visual spectral range.