Glass of certain formulations to get the different wavelengths of light to focus to the same point along with coatings to do the same
Look at a cutaway image of a lens system to see the construction
Like 11 elements in 7 groups if you want the exact composition of the lenses quite secretive with their recipes for glass or plastic elements
Main products are Optical Windows, Mirrors, Prisms, Lenses, waveplates and Color Filters, we also supply various of coatings.
For more: http://antyco.com/
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