You are not logged in. [Login] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Telescope Specific Forums >> Meade ETX Previous   Index   Next   Threaded   Pages: 1 Gargoyle super member Reged: 03/13/08 Posts: 136 Loc: Long Island, New York ETX-125 Red Dot Viewfinder       #3393203 - 10/16/09 03:24 PM Edit   Reply   Quote Quick Reply   You all know the red dot viewfinder that comes with the 125? Its OK, I sort of like to keep it but the glass lens fell out. Looks like the glue that held it in dried out and crystalized. I was thinking about how best to replace it, which adhesive would be best. Any ideas what to use? I thought of a small coat of silicone. Thanks in advance for your ideas!!!! Jerry -------------------- Meade 8" f/10 LX90 GPS Meade 10" LX200-R on permanent pier MoonLite CS 2" Focuser ETX-125 PE StellarVue SV80ED(Blue)and F50M2 Finder Scope DSI ProII DSI III Post Extras:       StarWars Postmaster Reged: 11/26/03 Posts: 13796 Loc: CyberSpace Re: ETX-125 Red Dot Viewfinder [Re: Gargoyle]       #3393878 - 10/16/09 11:37 PM Edit   Reply   Quote Quick Reply   You could use a super glue GEL or some clear gorilla glue... Typically the hardware store carries a variety of adhesives.. -------------------- Sony Digital Media player.. MX 460 earbuds Celestron 2x Barlow Lens Orion Collimation Eyepiece Rigel Quick Finder Assorted Bino's Post Extras:       Gargoyle super member Reged: 03/13/08 Posts: 136 Loc: Long Island, New York Re: ETX-125 Red Dot Viewfinder [Re: StarWars]       #3393916 - 10/17/09 12:00 AM Edit   Reply   Quote Quick Reply   Makes sense..... I thought however that being the lens was glass it would not stick with plastic type adhesive, hence my tilt towards silicone. But super glue sounds good to go.... thanks much!!!! -------------------- Meade 8" f/10 LX90 GPS Meade 10" LX200-R on permanent pier MoonLite CS 2" Focuser ETX-125 PE StellarVue SV80ED(Blue)and F50M2 Finder Scope DSI ProII DSI III Post Extras:       Treehopper professor emeritus Reged: 07/29/08 Posts: 582 Loc: Upstate NY Re: ETX-125 Red Dot Viewfinder [Re: Gargoyle]       #3395012 - 10/17/09 06:40 PM Edit   Reply   Quote Quick Reply   If it's actual plastic, cyanoacrylate ("super glue") will chemically react with the plastic and cause crazing and disfiguring of the lens. If there's any oil or residue on the plastic, the glue will react to it. (This is why they often use "super glue" on those popular crime scene shows to get fingerprints to pop up.) Your initial instinct is correct. A silicone based adhesive would be better. Not only will it be less likely to chemically react with the lens, but it tends to be more flexible over a wider range of temperatures, so it's less likely to crack, peel, or break down in extreme hot or cold observing conditions. -------------------- Tim Champion of small aperture scopes everywhere! Meade ETX-125PE Meade ETX-80 Celestron FirstScope 76mm Mini-dob Updated: 09/16/2009 Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 1 registered and 2 anonymous users are browsing this forum. Moderator:  Shadowalker, oldsalt  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 193 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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