Gilligan wrote:

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.


I doubt that it is even worth a service on such binoculars (given labor
coists etc). It may be just cheaper to buy new.

Cheers