A sensible answer among a bunch of assumptions.

Thanks for the rare find . . .

CN


"Gilligan" wrote in message nk.net...
All gases will leak out over time. How long it remains in depends on the
type of work you do with them. Aboard aircraft, and at high altitudes they
leak faster. Drop them and they may leak. Heat them up and they may leak.
Cool them too much and they may leak. Note all the optics are in a nitrogen
atmosphere either. Send them in for service every ten years and you'll be
fine.

Gilligan
"Capt. Neal®" wrote in message
...
My Fujinon binoculars are at least fifteen years old
now and still working like new though they look a little
beat up.

Amazingly they do not fog up inside the lenses.

They are filled with "dry nitrogen" at the factory
but I find it hard to believe this inert gas has
stayed in there over all the long years.

Anybody here happen to know how long nitrogen
really remains in those filled binoculars?

CN