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] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> ATM, Optics and DIY Forum Previous   Index   Next   Flat   DSalters sage Reged: 03/03/07 Posts: 438 Loc: High Ridge, MO (St. Louis) Is this an example of offsetting?       07/02/08 06:15 PM Attachment (29 downloads) Edit   Reply   Quote   Quick Reply:   I recently purchased a Celestron 5" f/5 OTA (minus the "T"). In the picture below you will see the secondary mirror stuck to the spider assembly with a thick, double-sided foam-tape. Anyway, I am struck by the amount of what looks like offset of this mirror. If this is offset, why is it so extreme? Newt calculates an offset of less than 1/10". I will be redoing this spider and remounting the mirror. I don't plan on offsetting the new configuration though. I just want to know if there is a good reason that it currently looks the way it does. Thanks, Daniel -------------------- 6" f/8 Bushnell Voyager Dob. Rebuild 10" f/5 Highe Dob. variant (UNDER CONSTRUCTION: 5" f/5, 8" f/6, 13" f/4.6) Baader Hyperions--Primary Eyepieces "The sun has one kind of splendor, the moon another and the stars another; and star differs from star in splendor." -1 Corinthians 15:41 Post Extras       Entire thread Subject Posted by Posted on Is this an example of offsetting? DSalters 07/02/08 06:15 PM Re: Is this an example of offsetting? Jason D   07/02/08 09:59 PM Re: Is this an example of offsetting? DSalters   07/03/08 06:00 PM Re: Is this an example of offsetting? DSalters   07/03/08 06:03 PM Re: Is this an example of offsetting? Vic Menard   07/03/08 07:47 PM Re: Is this an example of offsetting? Houdini   07/02/08 08:08 PM Extra information 18 registered and 8 anonymous users are browsing this forum. Moderator:  Don W, Joe Cipriano  Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Rating: Thread views: 227 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 Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   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 Home

Cloudy Nights Sponsor: Astronomics