· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums 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   Threaded   Pages: 1 JohnMurphyRN sage Reged: 09/09/12 Loc: Near St Louis Cost to refigure..       #5535161 - 11/23/12 10:03 AM Edit   Reply   Quote Quick Reply   I'm sure we've all seen that 28" Nova mirror for sale, the one with astigmatism and turned edge. What would it cost(rough guess) to have something like that brought up to premium level, or can it be done? Post Extras:       Mirzam Post Laureate Reged: 04/01/08 Loc: Lovettsville, VA Re: Cost to refigure.. [Re: JohnMurphyRN]       #5535355 - 11/23/12 12:05 PM Edit   Reply   Quote Quick Reply   You should probably direct your question to Mike Lockwood or Steve Swayze. The quality of the mirror blank anneal could be a factor. You may be able to get a ballpark estimate, contingent on the glass being acceptable. If the mirror was properly worked and still has astigmatism that is not a good sign. JimC Post Extras:       kfrederick Carpal Tunnel Reged: 02/01/08 Re: Cost to refigure.. [Re: Mirzam]       #5535635 - 11/23/12 02:29 PM Edit   Reply   Quote Quick Reply   The bad edge could be masked off. The astigmatism could from bad glass Or not . Just because someone see astig does not say it has astig . On a test stand if not properly done can show astig on such a big mirror Or improperly mounted in a telescope . James at OMI would who I would check it out . Post Extras:       Mirzam Post Laureate Reged: 04/01/08 Loc: Lovettsville, VA Re: Cost to refigure.. [Re: kfrederick]       #5535723 - 11/23/12 03:22 PM Edit   Reply   Quote Quick Reply   Very good points. The mirror in question appears to have been used in a rather interesting homemade scope. Was the mirror properly supported? Was the structure warping things out of collimation? JimC Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 3 registered and 16 anonymous users are browsing this forum. Moderator:  ausastronomer, richard7  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 402 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    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   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*Speciality Forums* -----   Arizona Science and Astronomy Expo   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*Swap and Shop* -----   Shop and Swap Audio Components*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   IYA Archive Info CN Forums Home

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