BINOCULAR ASTRONAMY

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BINOCULAR ASTRONAMY

Postby brian mac » Wed Oct 11, 2006 10:06 pm

[size=1]HI, EVERYBODY, I WAS READING AN ARTICLE IN A MAG ABOUT BINO ASTRONAMY[/size]
[size=1]A VERY GOOD ONE, BUT AS IN ALL MAGS THEY ARE ALWAYS REFERING TO IDEAL[/size]
[size=1]CONDITIONS, FOR EXAMPLE, NO MOON, NO LIGHT POLUTION ETC. IT SAYS THAT[/size]
[size=1]YOU SHOULD GET DOWN TO 11.5 MAG WITH 10X50 BINOS WHEN IN REALITY[/size]
[size=1]MOST PEOPLE ARE LUCKY TO GET THAT WITH A DECENT TELESCOPE, I WAS THINKING[/size]
[size=1]PERHAPS THAT THERE COULD BE AN AVERAGE OR A SCALE TO DENOTE CITY, SUBERBS AND COUNTRY SEEING, PEOPLE DON'T REALISE THAT THE MORE YOU MAGNIFY, THE MORE [/size]
[size=1]YOU ALSO MAGNIFY THE LIGHT POLUTION.[/size]
[size=1]SOME PEOPLE GET GREAT VIEWING WITH 10X50 AND SOMEONE ELSE MIGHT NEED 15X70 [/size]
[size=1]FOR THE SAME VIEW. SOME BEGINNERS MIGHT GET SOME 10X50 BINOS AND FIND THEY [/size]
[size=1]CAN'T SEE MUCH AT ALL FROM THERE CITY BACK YARD, AND THE DEFANITION OF A [/size]
[size=1]SMALL,MEDIUM AND LARGE SCOPE CAN BE MISSLEADING.[/size]
[size=1]A 60MM REFRACTOR IS A SMALL ONE AND THE KECK SCOPE IS A BIG ONE TO ME[&:][/size]
[size=1]OR AM I BEING DAFT......[/size][size=3]BRIAN[/size]
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RE: BINOCULAR ASTRONAMY

Postby skymaster » Thu Oct 12, 2006 3:20 pm

hi,Brian yes light pollution is bad!i use my bino's a lot for
observing.i've seen more detail with them than with my telescopes.
other times it's the other way round.i saw comet swan last night,through my 20x60's and 25x100's.yet i tried with my 6'' reflector,25 mm ep,i think due to
the light i could not see so much detail??. strange!!
rgds,andy
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RE: BINOCULAR ASTRONAMY

Postby les » Thu Oct 12, 2006 8:03 pm

HI Brian Andy,
Seeing conditions can play strange tricks somtimes,comets can actually look better through smaller insruments,a few times I found that Hale Bopp looked more impressive through the finderscope than through the main instrument! One evening last spring while observing comet Schassmann-Wachmann I got a better veiw of the comet with a 8" reflector than a 12"one.Strange.
Regards and clear skies Les.
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RE: BINOCULAR ASTRONAMY

Postby barnardstar2 » Mon Oct 30, 2006 12:16 am

Thats an easy one, its because your binoculars gather more light than your telescope. For example a pair or 10x50 bins have an aperture of around f2 whereas your 6" reflector and 25mm eyepiece has an aperture of f8.

For large faint objects bins are better for your eyes and additionally your brain has twice the image data to work with,
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RE: BINOCULAR ASTRONAMY

Postby sftonkin » Mon Oct 30, 2006 7:30 am


[quote]ORIGINAL: barnardstar2
10x50 bins have an aperture of around f2
[/quote]

AFAIK there are no f/2 binoculars (AFAIK there isn't an eyepiece on the planet that works below f/3.5). Most operate around f/4 or f/5., with some specialist astro ones operating at f/8 or so.
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RE: BINOCULAR ASTRONAMY

Postby 3rd rock » Wed Nov 15, 2006 10:26 am

Brian

Have a look at the [url=http://en.wikipedia.org/wiki/Antoniadi_scale]Antoniadi[/url] Scale.

Jon.
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RE: BINOCULAR ASTRONAMY

Postby colin1562 » Sun Nov 26, 2006 1:10 am

3rd Rock

Whose he? The cat in Shrek 2?
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