· 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 Jerry-rigged sage Reged: 01/30/12 Loc: Coastal Texas. Surplus shed mirror+cell, 114mm?       #5656251 - 02/01/13 12:15 PM Edit   Reply   Quote Quick Reply   Anyone have an opinion of these mirrors from Surplus shed? 114mm dia, fl 900mm, F7.8, comes mounted in a plastic cell with spring loaded colmination bolts. They also have a 3 vein spider w/ secondary. $35 for both seem like a deal, if the mirror is decent. Question - at f7.8, will a spherical mirror be OK? SS says the don't know if they are parabolic or spherical, so I figure assume they are spherical... They also have a 114mm morror at f4.4, but I am guessing that if it is spherical, that one will be ugly... Post Extras:       furrysocks member Reged: 01/24/13 Re: Surplus shed mirror+cell, 114mm? [Re: Jerry-rigged]       #5656266 - 02/01/13 12:26 PM Edit   Reply   Quote Quick Reply   You could have fun making a small 4.5" binoscope with these. Post Extras:       dan_h Carpal Tunnel Reged: 12/10/07 Re: Surplus shed mirror+cell, 114mm? [Re: Jerry-rigged]       #5656350 - 02/01/13 01:17 PM Edit   Reply   Quote Quick Reply   << at f7.8, will a spherical mirror be OK?>> 114mm diameter, 900mm focal length, sphere is about 1/5 wave error on the wavefront, so yes, it could be a good little mirror if it is smooth to the edge. dan Post Extras:       Geo. Carpal Tunnel Reged: 10/01/08 Loc: Upstate NY Re: Surplus shed mirror+cell, 114mm? [Re: dan_h]       #5656956 - 02/01/13 06:55 PM Edit   Reply   Quote Quick Reply   These are hard to find on the market today. Most 114mm are being ground to f/3.6 for the Bird-Jones short tubes. I have a few steel tubes that these would work well in. Yours for the postage. Post Extras:       operascope sage Reged: 09/03/08 Loc: Canada Re: Surplus shed mirror+cell, 114mm? [Re: Geo.]       #5658951 - 02/02/13 09:25 PM Edit   Reply   Quote Quick Reply   That didn't take long. It appears that the item is already out of stock. Price was good while it lasted. Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 14 registered and 31 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: 373 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

Cloudy Nights LLC Cloudy Nights Sponsor: Astronomics