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My understanding is that all premium glass in the world either comes from Swarovski, Nikon and one other comapny I cant recall (Schott?), and that any premium binocular, camera or reilfescope maker uses glass from one of these three suppliers.
Coatings are proprietary as are the grinding. Zeiss does make some glass as does Lietz. Cheaper glass is made by Hoya
In terms of riflescope quality Schmidt und bender is waaay up there
WildicouldbewrongthoughAlaska
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