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Message: <blockquote data-quote="Hermann" data-source="post: 212842" data-attributes="member: 4925">The point is that helical focussing may start leaking when the threads become waterlogged and water is sort of "pumped" inside the body. That's probably the reason why Zeiss never called their 7x50BGAT "waterproof". O-rings may improve the situation somewhat, but they don't last forever, especially not when the some dust get on the O-rings.That said, I think the new Nikon scopes (EDIII and ED82) are very well sealed - but I'd always be a bit more careful with them than with, say, the Leica or the Zeiss. In fact, I used my old EDII for years in all sorts of weather and never had any problems, even though the EDII wasn't as well sealed as the EDIII. The only thing I did was to use some plain commonsense.Hermann</blockquote>