Power And Aperture In Binoculars
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Re: Power And Aperture In Binoculars
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Re: Power And Aperture In Binoculars
https://en.wikipedia.org/wiki/Rhodopsin
Thanks for this informative link Refractordude, and the best of regards.
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Re: Power And Aperture In Binoculars
I haven't seen that article before.
Lately of been using my binos more and more.
-Jeff
Member; ASTRA-NJ
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Re: Power And Aperture In Binoculars
Regards,
Peter
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Re: Power And Aperture In Binoculars
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
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Re: Power And Aperture In Binoculars
Man... That's some icky-tasting stuff!
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Re: Power And Aperture In Binoculars
REFRACTOR , TS-Optics Doublet SD-APO 125 mm f/7.8 . Lunt 80mm MT Ha Doublet Refractor .
EYEPIECES, Delos , Delite and 26mm Nagler t5 , 2 zoom Svbony 7-21 , Orion Premium Linear BinoViewer .
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Mounts , cg-4 motorized , eq6 pro belt drive .
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― Isaac Asimov
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Re: Power And Aperture In Binoculars
It depends. A 3mm exit pupil isn't bad for looking at large faint fuzzies. If you're in an are of light pollution it might work better than a 5mm exit pupil.
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Re: Power And Aperture In Binoculars
Holger Merlitz referred in his book "Handferngläser", 2019 Verlag Europa-Lehrmittel, to three other publicists about the matter. ( How good is your reading technical German language? It'd better be excellent)
It comes down that the four calculation methods do not differ all that much in their outcome. Bishop's method is by far the easiest to remember.
All methods are based on magnitude 6 or better naked eye limit.
In my experience and apparently of notFritzArgelander too, much depends on the light pollution.
For instance: M42 in a 20X60 is even a bit more impressive than in a 20X80 under light polluted skies. ( exitpupil 3 mm versus exitpupil 4 mm) Darker background, so more contrast with its background. Under really dark skies, the 20X80 might be more impressive.A 3mm exit pupil isn't bad for looking at large faint fuzzies. If you're in an are of light pollution it might work better than a 5mm exit pupil.
The high numbers of the Bisshop calculation might lead to false expectations though. 500 against 1600 for instance for a 10X50 against a 20X80. It seems a giant leap but in reality it is only a difference of 1.3 magnitudes. Visible of course, but not as spectacular as it seems when you hear 500 versus 1600. Knowing this, a difference of 250 on the Bishop scale might not be that impressive as one might expect.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
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Re: Power And Aperture In Binoculars
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