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Message: <blockquote data-quote="Binastro" data-source="post: 3381146" data-attributes="member: 111403">The glass elements in binoculars are different types in the same binocular. There are probably at least 150 glass types, so your question doesn't have an answer.Binocular makers either use standard glass types, which may differ depending on the glass maker or have their own type made up in expensive binoculars.There are also fluoride containing glasses or fluorite crystal.I think looksharp65 was referring to high index plastics and mineral glass.Did you buy the Swarovski in the U.K.?</blockquote>