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  1. NDhunter

    Nitrogen fill, how long

    Over the years I have had only 2 binoculars that had problems inside. One was a Swarovski 8x56 SL that fogged up. The other was a Swarovski 8.5x42 EL SV, that had some fungus growing. Both were serviced by Swarovski with no charge, much to my satisfaction. That is my experience over well over...
  2. NDhunter

    Nitrogen fill, how long

    Does it remain effective and before it leaks out ? Jerry
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