· 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 >> Cats & Casses Previous   Index   Next   Threaded   Pages: 1 ecoles journeyman Reged: 03/16/12 Collimation Celestron C90 (black rubberized)       #5374418 - 08/18/12 10:08 AM Edit   Reply   Quote Quick Reply   I just purchase a mid-90's Celestron C90. This is the black rubber coated with the 1.25 visual back. I had it out for the first time and notice that it was out of collimation. I spent a couple of hours last night web-searching for ideas on how to do this. Nobody had any great ideas, short of tearing the whole scope apart and even those seemed problematic. And their are no external adjustment screws. The consensus seems to be that these scopes are glued together and either well collimated or not and there is really nothing to do about this. But I am optimistic. the views from the scope are not bad. But I would like to have it collimated. Anyone have any ideas on how to do this. They would be appreciated. Thanks. Eric Post Extras:       orion61 Vendor(Clear Edge Optical) Reged: 10/20/07 Loc: NW Iowa BURRRR Re: Collimation Celestron C90 (black rubberized) [Re: ecoles]       #5374500 - 08/18/12 11:08 AM Edit   Reply   Quote Quick Reply   They were pre collimated at the factory, there is no way to align the optics, spinning the meniscus does no good as it is a sphere. sorry, they are better used as a spotter. or telephoto lens at prime focus, sorry Post Extras:       Geo. Carpal Tunnel Reged: 10/01/08 Loc: Upstate NY Re: Collimation Celestron C90 (black rubberized) [Re: orion61]       #5378088 - 08/20/12 05:48 PM Edit   Reply   Quote Quick Reply   Try cleaning and regreasing the helical focusing thread. If the menicus tube sags collimation will be off. Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 5 registered and 20 anonymous users are browsing this forum. Moderator:  Cotts, Starman27  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 423 Calendar Event: 08/18/12 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*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 CN Forums Home

Cloudy Nights LLC Cloudy Nights Sponsor: Astronomics