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What do BAK4 or BK-7 mean?

bak4 bk-7 mean
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What do BAK4 or BK-7 mean?

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BAK4 and BK-7 are common types of glass used in prisms. Both are types of crown glass, but BAK4 has a slightly higher level of refraction than BK-7. BAK4 is more expensive but is considered the better option because it creates a smooth, rounded exit pupil and a sharper image.

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