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Nitrogen purged binoculars

Binoculars in the higher segment of the market are made completely airtight once they have been purged with dry, dust-free nitrogen. This procedure guarantees that the binoculars remain free of dust and moisture. After purging with nitrogen, a small amount of residual air remains in the binoculars. Less residual air remains in more expensive binoculars than in cheaper ones.

The binoculars can be filled with nitrogen at a slight overpressure in order to increase the water density, which is a great advantage in many cases. But also binoculars without overpressure are hermetically sealed to guarantee excellent long-term performance.

Binoculars can also be filled with argon instead of nitrogen and the effects remain beneficial.