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   jkevn super member Reged: 03/02/06 Posts: 175 Loc: Tucson, Arizona Re: Brightness in Exit Pupil       06/15/07 11:04 PM Edit   Reply   Quote   Quick Reply:   What would cause the exit pupil brightness to be nonuniform (other than being clipped, or vignetted)? One cause, I know, is from BK7 prisms compared with BAK4 prisms. I have noticed in some binoculars the center of the exit pupil appears brighter than the circular region close to the perimeter. These were binoculars with BAK4 prisms (Nikon Action Extreme 10 X 50) Post Extras       Entire thread Subject Posted by Posted on Brightness in Exit Pupil EdZ 01/29/06 06:07 PM Re: Brightness in Exit Pupil jkevn   06/15/07 11:04 PM Re: Brightness in Exit Pupil grbrown   06/16/07 06:09 AM Re: Brightness in Exit Pupil Sgt   06/16/07 07:48 AM Re: Brightness in Exit Pupil EdZ   06/16/07 10:09 AM Re: Brightness in Exit Pupil 1stScope   06/16/07 11:22 PM Re: Brightness in Exit Pupil Mark9473   06/17/07 04:49 AM Re: Brightness in Exit Pupil Sgt   06/17/07 11:43 AM Re: Brightness in Exit Pupil 1stScope   06/17/07 02:57 PM Re: Brightness in Exit Pupil msc   05/26/08 05:59 PM Re: Brightness in Exit Pupil KennyJ   05/26/08 06:12 PM Re: Brightness in Exit Pupil msc   05/26/08 06:18 PM Re: Brightness in Exit Pupil ronharper   05/27/08 02:02 AM Re: Brightness in Exit Pupil GlennLeDrew   06/19/08 01:38 AM Re: Brightness in Exit Pupil EdZ   06/18/07 05:55 AM Re: Brightness in Exit Pupil 1stScope   06/18/07 10:44 AM Re: Brightness in Exit Pupil EdZ   06/18/07 04:52 PM Re: Brightness in Exit Pupil Mark9473   06/17/07 03:04 PM Re: Brightness in Exit Pupil EdZ   01/29/06 08:30 PM Re: Brightness in Exit Pupil DJB   01/30/06 04:22 AM Re: Brightness in Exit Pupil Anonymous   01/30/06 09:37 AM Extra information 4 registered and 14 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: 1619 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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