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What is Bak4 or BK7?

bak4 bk7
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What is Bak4 or BK7?

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A24. These are grades of optical glass used in the prisms of binoculars. The highest quality prisms are made with high-density BAK-4 glass, giving optimal clarity and brightness. Only inexpensive binoculars use the inferior BK7 grade of glass.

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