Optical Coatings
Since a typical binocular has 6 to 10 optical elements with special characteristics and up to 16 air-to-glass surfaces, binocular manufactures use different types of optical coatings for technical reasons and to improve the image they produce.
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Famous quotes containing the word optical:
“The convent, which belongs to the West as it does to the East, to antiquity as it does to the present time, to Buddhism and Muhammadanism as it does to Christianity, is one of the optical devices whereby man gains a glimpse of infinity.”
—Victor Hugo (1802–1885)