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  1. WJC

    Vintage Swift Saratoga MkI 8X40 Binocular

    Bk7 or BaK4; not Bak7. In the BaK types, Schott goes directly from BaK6 to BaK50, with nothing between. Many folks new to optics see only one or two kinds of "optical glass." Currently, Schott produces 120 kinds. Then, there is Ohara, Hoya, Lytkarino, and others. And unlike what so many people...