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What do the BK-7 & BAK-4 designations mean?

April 26, 2017bak-4 bk-7 designations mean

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What do the BK-7 & BAK-4 designations mean?

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These are identifying codes for two types of glass used in spotting scope prisms. BK-7 refers to a borosilicate glass. BAK-4 refers to a barium crown glass which is the higher quality glass and yields brighter images and high edge sharpness.