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 >> Binoculars Previous   Index   Next   Flat   neoweb Pooh-Bah Reged: 12/10/06 Posts: 1482 Loc: UK Re: What does the 'Visibility Index' tell you?       01/03/07 04:51 PM Edit   Reply   Quote   Quick Reply:   Thanks, Edz, it was interesting reading that entire thread, including many of the offshoots. You concluded by saying: "Magnification (Adler index) will have greater emphasis IF your targets are stars. Aperture and exit pupil will have greater emphasis if your targets are extended objects such as faint nebula and galaxies." My targets are galaxies, nebula AND star clusters. So an emphasis on aperture? The idea is to move on from my existing 15x70mm Skymasters (multi-coated, BAK-4) to 20x90mm Strathspeys (fully multi-coated with broadband coatings on all surfaces including the prisms, BAK-4) -------------------- Celestron StarHopper 8" f/6 Dob 38mm Burgess 2" SWA | 30mm Ultima | 20mm Omni 17mm Hyperion | 12.5mm Baader Ortho 8mm TV Plossl | 6mm TMB/BO Planetary Orion Shorty Plus barlow 15 X 70mm Skymasters Saturn-like: desktop image Post Extras       Entire thread Subject Posted by Posted on What does the 'Visibility Index' tell you? neoweb 01/03/07 11:51 AM Re: What does the 'Visibility Index' tell you? EdZ   01/03/07 12:06 PM Re: What does the 'Visibility Index' tell you? neoweb   01/03/07 04:51 PM Re: What does the 'Visibility Index' tell you? KennyJ   01/03/07 05:30 PM Re: What does the 'Visibility Index' tell you? patter1   01/03/07 06:20 PM Re: What does the 'Visibility Index' tell you? EdZ   01/03/07 08:09 PM Re: What does the 'Visibility Index' tell you? edcannon   01/04/07 02:58 AM Re: What does the 'Visibility Index' tell you? neoweb   01/06/07 07:16 PM Re: What does the 'Visibility Index' tell you? EdZ   01/06/07 08:06 PM Extra information 11 registered and 17 anonymous users are browsing this forum. Moderator:  EdZ  Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Rating: Thread views: 366 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

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