Funny, I was told that S&B, Swarovski, Meopta, Minox and Ziess all used glass made by Shott. The higher ends used a bit better grading than Meopta and Minox. This person who is a retailer of all those brands, attends SHOT and all the industry conferences also told me that Ziess and Shott were basically one in the same company.
This person also told me that there are three Manufacturers of optical type glass used in sport optics, Shott, Bausch & Lomb and the Japanese company (just can't remember the name). Most all Japanese and American names buy the Japanese glass. The difference comes in some of the coatings applied.
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