· 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 >> Eyepieces Previous   Index   Next   Threaded   Pages: 1 Gargoyle super member Reged: 03/13/08 Posts: 137 Loc: Long Island, New York Tapered Vs. Ridge Line Eyepieces       #3432035 - 11/05/09 10:15 PM Edit   Reply   Quote Quick Reply   Hey All, Pardon my ignorance, but I want to post a question concerning tapered eyepieces vs. groved. How do the tapered ones work? My assumption is that they are "negatively" tapered, that being tapered to the intent as to stop eyepieces from dropping out of constricted areas, meaning that the taper is larger at the top of the eyepiece to restrict slippage. And how about groove eyepieces.... is this better? For use do you have to hit the "groove" to maintain secure or correct alignment - adjustment? I usually "float" the eyepiece within the tube and then lock to best focus (with my 80mm). I can see where a tapered eyepiece is a smart idea.... is my thinking of this correct? 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:       Lane Carpal Tunnel Reged: 11/19/07 Posts: 1515 Loc: Frisco, Texas Re: Tapered Vs. Ridge Line Eyepieces [Re: Gargoyle]       #3432099 - 11/05/09 10:50 PM Edit   Reply   Quote Quick Reply   You got it. The whole barrel is not tapered just a small section at the top and it tapers down as you go towards the top of the eyepiece. They work about the same as the grooved type but the taper will not get caught on the brass ring so it comes out easier. -------------------- Mounts: CGEM, ORION SIRIUS, AT Voyager/motorized SCTs: C6, C8, C9.25, C11, Refractors: TV Pronto, Orion ED80 Post Extras:       skypilgrim professor emeritus Reged: 12/25/06 Posts: 558 Loc: Under a cloud Re: Tapered Vs. Ridge Line Eyepieces [Re: Gargoyle]       #3432707 - 11/06/09 11:21 AM Edit   Reply   Quote Quick Reply   Tapered is better than sharp undercuts but neither allow parfocalizing rings which is why most of us prefer the old straight barrels. Sam -------------------- AL Messier certificate #2078 AL Double Star certificate #354 Area of interest: Cultural Astronomy My Blog: http://fathersky.wordpress.com/ Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 13 registered and 15 anonymous users are browsing this forum. Moderator:  Greg K., Jason B, csa/montana  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 96 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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