Improves light transmission from about 92% (uncoated glass) to about 98%
MC Nano coating makes it easier to clean the filter - water will bead up faster
B+W filters provide additional benefits of correction for Ultraviolet(UV) light which can register on film and videotape as a bluish cast and can obscure distant details
If desired they can be left on the lens at all times for protection
Ultraviolet filters allow you to correct for the UV effect to varying degrees
UV filters are ideal for high altitude photography, by the sea and in regions with very clean air