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Message: <blockquote data-quote="elkcub" data-source="post: 2094177" data-attributes="member: 14473">I hate to be the one to bust the bubble, but, factually, neither the original 820 nor the 820ED were nitrogen filled.  The 804ED that preceded them was not nitrogen filled either.  I'm not sure about the new 820s, which have a different construction and may or may not be nitrogen purged.  While rumor busting, the original 820ED also did not have air-spaced objectives like its predecessor the 804ED.  This has all been confirmed by Nicolas Crista, and apparently resulted from a bit of faulty advertising, which I've seen evidence for in several catalogs and fliers.For these models, then, "waterproof" simply meant that o-rings were used at various locations to prevent water flooding into the innards.  Its effectiveness has been questioned by many, and it's not comparable to the waterproofing given to internally focusing roof designs.  Regards,EdBkrownd, I'd suggest contacting Nicolas Crista about repairing your soggy binoculars.  <a href="http://www.nrcoptics.com/" target="_blank">http://www.nrcoptics.com/</a></blockquote>