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Nanocoating: New and Different! To more specifically address the "Nano Crystal Coating" type of lens coating, as other answers seem to be either addressing multicoating in general or think nanotechnology coating is just a marketing term. Nanocoating is actually NOT the same as multicoating, it is very different in design, and affects light in a different ...

Coatings are just special chemical compounds that are applied to the surface of glass filters and lens elements in order to change their optical properties usually in order to reduce reflections and other unwanted effects, as well as repealing water and grease, and providing resistance to scratches.

No, it is not. EBC is described as "multilayer coating": All the lens elements used in the X-S1 have been treated with multilayer Super EBC (Electron Beam Coating), Nanocoating however is NOT multicoating, it is a different process.

Pentax patented "Super-Multi Coating" in 1971 while still making M42 lenses. This coating is still in use today and I'm not aware of anything actually doing much better with the exception of another Pentax coating. Which means, to answer your first question: there's no difference. :) Bojidar Dimitrov has a a very good writeup on the Pentax SMC and what it ...

Here's a description of Pentax's implementation of nanocoating, called Aero Bright Coating (source): ...[the] PENTAX-original Aero Bright Coating...ensures outstanding anti-reflection performance over a broader wavelength range to deliver images that are brighter and of higher quality. Created using PENTAX’s advanced nanotechnology, this exclusive ...

I don't think the Nano crystal coat improves sharpness in and of itself. What it does, however, if give the lens designer more freedom in designing the lens. Before coatings came into use, practical lens designs were limited to about 5 element groups (at very most). Single coating increased that to around 7 or 8. Multicoating increased it to around a dozen ...