Answered By: Ken Burns
Last Updated: Jul 19, 2016     Views: 170

I suspect BK7 is a type of Schott Glass. From their website, http://www.us.schott.com/english/ type BK7 into their "Search" button -- I came up with 5 documents.  You may want to contact Schott for more information about the glass and how it can be used.

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