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Message: <blockquote data-quote="kabsetz" data-source="post: 3587474" data-attributes="member: 10167">Gijs,What you say about the maker needing to know what they are doing is true. However, Kowa has been making scopes with pure fluorite crystal since the TSN3/4 introduced in the 1980s, and their track record is excellent. They certainly know how to make the fluorite last. I have not heard of any problems with Kowa fluorite scopes that would be resulting from the choice of lens material.Kimmo</blockquote>