Binoculars
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Adrian Pearce - January 26, 2021
Nitrogen is used in Rifle Scopes along with many other Optics; Binoculars, Spotting Scopes etc.
Quite simply, this is done to create a positive pressure to remove any ambient air laden moisture/oxygen that is evident in the manufacturing process, which would then become trapped, and be far more susceptible to cause issues such as internal fogging.