Nikon has a single Nano Crystal Coating, while Canon has not only an equivalent coating (Sub Wavelength Coating), but they also have an Air Sphere coating which seems to do much the same thing. Why does Canon have two kinds of similar coatings? Is one cheaper but not as good? Do they do significantly different things? Is one of them weaker to such an extent that it needs to be combined with traditional lens coatings on the same surface to get best results?
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