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   Anonymous Unregistered Re: Effect of exit pupil on colors of stars and DSO       03/03/04 08:36 AM Edit   Reply   Quote   Quick Reply:   The ability to see some colors is mostly dictated by the natural sensitivity of our eyes and not so much having to do with the exit pupil size. Human eyes are most sensitive to the color green and much less to the color red (rods and cones). For example, this is why hydrogen[I] emission nebula are nearly impossible to observe with just your eyes...like the Horse Head Nebula. But M42, which possess hydrogen[I], has a moderate concentration of oxygen[III] which emits green light. Thus you can see the ghostly green component of M42's total emission. Post Extras       Entire thread Subject Posted by Posted on Effect of exit pupil on colors of stars and DSO Anonymous 03/02/04 06:47 PM Re: Effect of exit pupil on colors of stars and DSO EdZ   03/02/04 09:34 PM Re: Effect of exit pupil on colors of stars and DSO Anonymous   03/02/04 11:26 PM Re: Effect of exit pupil on colors of stars and DSO Anonymous   03/03/04 08:36 AM Re: Effect of exit pupil on colors of stars and DS wilash   03/04/04 03:01 AM Re: Effect of exit pupil on colors of stars and DSO KennyJ   03/02/04 07:50 PM Re: Effect of exit pupil on colors of stars and DSO Anonymous   03/02/04 08:32 PM Extra information 12 registered and 24 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: 346 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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