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 Astrophotography and Sketching >> Beginning Imaging Previous   Index   Next   Flat   PascalN newbie Reged: 04/13/08 Posts: 4 Re: Hyperstar       08/16/08 05:54 PM Edit   Reply   Quote   Quick Reply:   That's my thinking. I also have a Sky90 with the f/4.5 reducer/corrector. But, for extended objects the "speed" of a f/2 system allows much shorter exposure times. The C14 with Hyperstar is F/1.9 !! With fl=710 mm. That gives the image scale that I'm looking for, with the promise of faster imaging. Cheers! Pascal Edit: I have learned that a better estimate of the C14 Hyperstar f/1.9 focal length is 675 mm. Edited by PascalN (08/17/08 12:33 PM) Post Extras       Entire thread Subject Posted by Posted on Hyperstar LightPolution 08/15/08 09:43 PM Re: Hyperstar PascalN   08/16/08 10:39 AM Re: Hyperstar D_talley   08/16/08 11:30 AM Re: Hyperstar jrcrilly   08/16/08 12:21 AM Re: Hyperstar LightPolution   08/16/08 09:24 AM Re: Hyperstar jrcrilly   08/16/08 11:36 AM Re: Hyperstar LightPolution   08/16/08 01:50 PM Re: Hyperstar LightPolution   08/16/08 01:55 PM Re: Hyperstar PascalN   08/16/08 05:54 PM Re: Hyperstar jay52   08/16/08 06:21 PM Re: Hyperstar PascalN   08/16/08 07:53 PM Re: Hyperstar LightPolution   08/15/08 09:49 PM Re: Hyperstar ratdog11   08/15/08 11:10 PM Re: Hyperstar LightPolution   08/15/08 11:14 PM Extra information 11 registered and 3 anonymous users are browsing this forum. Moderator:  Charlie Hein, knuklhdastnmr  Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Rating: Thread views: 298 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 CN Forums Home

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