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August 09, 2013

Magnifying Glasses

Marine binoculars bring you closer to the action.

Manufacturer Contacts

Bushnell Outdoor Products
Overland Park, Kansas
800-423-3537
bushnell.com

Canon U.S.A. Inc.
Melville, New York
631-330-5000
usa.canon.com

FLIR Systems Inc.
Wilsonville, Oregon
877-545-5094
flir.com

Fujinon
Wayne, New Jersey
973-633-5600
fujifilmusa.com

Nikon Inc.
Melville, New York
631-547-4200
nikon.com

Steiner
Greeley, Colorado
970-356-1670
steiner-binoculars.com

West Marine
Watsonville, California
800-262-8464
westmarine.com

Add a Shot of Nitrogen

Sealed with O-rings and gaskets, marine ­binoculars are built to keep out water. They can also be purged and maintained with dry nitrogen, which helps eliminate moisture and fogging.

Steiner binoculars, for example, feature a two-way valve that “lets us draw a vacuum ­simultaneously on each barrel [in the factory],” says Dennis Phillips, the company’s marketing manager. “This removes any oxygen and moisture from inside the barrel. The factory instrument then uses the vacuum to suck in dry nitrogen to pressurize and seal the barrels.

“If oxygen is left in the barrels, temperature and pressure changes can create ­condensation. When the condensation dries, it leaves a film that can cause internal fogging, but this won’t happen with nitrogen.”