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Fogproof binoculars are sealed and purged internally to prevent moisture from entering. Fogging may render a binocular useless. To prevent this, fog-proof binoculars are purged of air and filled with dry nitrogen or argon that does not condense on internal surfaces during rapid temperature changes or extremes. For hunting, camping, or use through changing temperatures, you'll want a good fogproof binocular.

Fogproof Binoculars

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