Modern lenses are coated with a very thin layer of antireflective material (like magnesium fluoride or calcium fluoride). This lens coating is applied to the each element of a lens which has a surface exposed to air.
Antireflection coating
One or more thin layers of refractive material ( often magnesium fluoride ) coated upon the surface of a lens to minimize surface reflection. It is deposited on the lens by vaporization of the metal in vacuum.
-Coated lens - lens with air-glass surfaces which have been coated with magnesium fluoride to reduce lens flare.
Coated lens: A lens with coated surface such as magnesium fluoride to reduce flare.
Color conversion filters: Color filters used to correct the color temperature of a light source to suit the color balance of films.
 See also: Negative, Scale, Daylight, Shutter, Barrel
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