· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Binoculars Previous   Index   Next   Threaded   Pages: 1 jkevn sage Reged: 03/02/06 Posts: 211 Loc: Tucson, Arizona Fogproof Binoculars       #3380171 - 10/09/09 10:53 AM Edit   Reply   Quote Quick Reply   I notice that the specs for the Swift Audubon 8.5X44 say that they are waterproof, but reading reviews, it appears that they are not fogproof. It seems kind of odd that the manufacturer wouldn't purge them with dry nitrogen if they went to the trouble of sealing them. How important is this? Are the inside optical surfaces stained if they become fogged? It seems like for fogging to occur, the binoculars would have to be cooled down very fast, such as when they are taken outside in winter. I am wondering what temperature differences might cause this to happen? Post Extras:       BobinKy Carpal Tunnel Reged: 04/27/07 Posts: 1682 Re: Fogproof Binoculars [Re: jkevn]       #3380677 - 10/09/09 03:43 PM Edit   Reply   Quote Quick Reply   Jkeven... This is an excellent topic. I hope we see some good discussion. 100% waterproof and fogproof binoculars usually are the roof, individually focused porro, and internally focused porro. Many of the binoculars that are advertised as waterproof might be better described as water resistant. I will leave the explanations to the technical experts. There is much to be said. I hope this becomes the hot thread of the weekend. -------------------- Bob 38°N Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 5 registered and 13 anonymous users are browsing this forum. Moderator:  EdZ  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 110 Jump to *International Year of Astronomy 2009* -----   Global Coordination   Cornerstone Projects   Special Projects   Special Task Groups   Global Activities   National and Regional Activities   IYA 2009 in Africa   IYA 2009 in the USA*Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Beginners Forum   Celestial Events   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Celestron SkyScout and Meade mySky   Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   General Observing   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Other* -----   Science of Astronomy & Space Exploration   AstroWebsites   Space Rocks*Speciality Forums* -----   AstroArt   Astronomy Software & Computers   Stellar Media   Astro Outreach, Clubs and Star Parties*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements CN Forums Home

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