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Why are the binoculars filled with nitrogen?

binoculars filled nitrogen
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Why are the binoculars filled with nitrogen?

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A nitrogen atmosphere inside binoculars prevents internal fogging. Without any air inside the binocular, there is no humidity, and thus no condensation, even during a temperature change. And because the binoculars are airtight, they are also watertight and may be submerged.

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