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Message: <blockquote data-quote="Rathaus" data-source="post: 3307699" data-attributes="member: 132018">Yeah I often wonder how long sealing lasts even in the best bins. A test is to shove an ice cube against the lens and see if any condensation forms on the inside. There's no way I'd recommend or will be doing this test myself because many good bins will have some water Vapor in them and once it condenses under the influence of an ice cube it will leave a film when it dries back off. I've done this test with various diving watches. It seems apparent that The inside of A watproof diving watch which has been serviced and sealed in a low humidity environment will still eventually equalise with the ambient humidity....over use and time (I live in a high humidity zone)...I know its through actuating the crown etc but it's still an interesting phenomenon. A small amount of condensation from the ice cube test has not generally signalled a problem (watches aren't nitrogen purged), however I opened the back on one watch (which would condensate in front of the car aircon) and heated its movement with a blow dryer then closed it back up...absolutely no problem since.A bit off topic sorry, but you raise an interesting point.Cheers,RathausPs. I unscrewed one of the individual focus eyepieces on a newish pair of military Habicht to remove its reticle. I waited for a lowish humidity day, put the aircon on to further reduce humidity, then held my breath for the entire quick procedure. Without wanting to be vulgar, I can confirm that my sphincter was puckering the whole time :eek!:</blockquote>

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