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azure1961p
Postmaster
Reged: 01/17/09
Loc: USA
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Bino Limiting Mag difference?
#5264224 - 06/10/12 01:20 AM
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Im set on the maxbright, its in the mail, regardless Im curious. Has anyone ever done a faint star limitging magnitude with binos compared to single ocular use? Yes, the binos are dimmer, BUT they elimimate a lot of visual noise as well and the retinas act as redundant backup covering where the other might not due to blind spot or random sensitivity fluctuations.
Thanks in advance guys.
Pete
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Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
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Re: Bino Limiting Mag difference?
[Re: azure1961p]
#5264248 - 06/10/12 01:53 AM
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About half a magnitude, but the limit is easier to reach in the bino, compared to mono, so the immediate difference seems smaller. And some objects, notably globular and compact open clusters, look much better in bino. Only on very extended objects, where it can be difficult to get a true field large enough to frame it properly, do I prefer mono. Sort of, because I then just go inside and get a smaller scope out, which has a larger field, even with binoviewers. I can get a 3° field in the binoviewer with my ED 72.
Clear skies!
Thomas, Denmark
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azure1961p
Postmaster
Reged: 01/17/09
Loc: USA
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Re: Bino Limiting Mag difference?
[Re: Astrojensen]
#5264411 - 06/10/12 08:57 AM
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Thanks Thomas!
You did great drawings of M51 and such with small aperture. Could you have done the same or better without the binos?
Pete
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Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
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Re: Bino Limiting Mag difference?
[Re: azure1961p]
#5264681 - 06/10/12 12:36 PM
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Quote:
You did great drawings of M51 and such with small aperture. Could you have done the same or better without the binos?
Thanks Pete
Well, perhaps, but I am inclined to say no. Observing with the bino is much more comfortable for me, so I spend a lot more time behind the eyepiece on each object, and as a direct consequence, I see a lot more detail. The mono image is brighter, but there is also a lot more noise, the background is brighter, with the bino the image is a little fainter, but contrast is a *lot* better, so I see more detail in the brighter objects.
Clear skies!
Thomas, Denmark
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azure1961p
Postmaster
Reged: 01/17/09
Loc: USA
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Re: Bino Limiting Mag difference?
[Re: Astrojensen]
#5264890 - 06/10/12 03:13 PM
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If you were chasing down the fainter galaxies however at the apertures threshold where dalaxies are a minute wide, would u still employ the bino or go mono?
Pete
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Astrojensen
Post Laureate
Reged: 10/05/08
Loc: Bornholm, Denmark
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Re: Bino Limiting Mag difference?
[Re: azure1961p]
#5264916 - 06/10/12 03:29 PM
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Hi Pete
If I was trying to hit the absolute limit for my aperture, I'd go mono. But that involves a lot of work. To reach my limit with a certain aperture takes at least a half hour or more, per object (1). I am getting old and lazy, so I prefer to just leave the bino in place and see what I can see... (2)
In many ways, the binoviewer has changed me as an observer. The "paradigm shift" phrase is overused, but it really fits here. I have essentially stopped the quest for ever-fainter objects and begun dwelling more at the individual objects and their surroundings. I use lower powers more, to get the big picture, so to speak. I feel I have benefitted enormously from the binoviewer as a deep-sky observer, not been handicapped by it.
Clear skies!
Thomas, Denmark
1) I did this a LOT some years ago and got quite good at it, so perhaps I am pushing the limits further than most people.
2) And perhaps it's still carrying over to my relaxed observing of today. I have no trouble resolving the outer stars in M13 through my 63mm Zeiss with binoviewer, for example.
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Mike B
Starstruck
Reged: 04/06/05
Loc: shake, rattle, & roll, CA
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Re: Bino Limiting Mag difference?
[Re: Astrojensen]
#5269916 - 06/13/12 04:52 PM
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If I was trying to hit the absolute limit for my aperture, I'd go mono. But that involves a lot of work.
Similar "work" that could be employed to reach deeper might be relocating to a darker-sky site, higher altitude, finding better seeing, and/or sites & conditions having better transparency. Any of these steps could yield better reach... to say nothing of buying a bigger and/or better scope to BV with. 
What? You're still using regular ol' Mark I eyeballs? You need to upgrade to image-intensified bino's! 
The chase is endless... the "compromises" plentiful. Yet Thomas totally nails it here:
Quote:
I have essentially stopped the quest for ever-fainter objects and begun dwelling more at the individual objects and their surroundings. I use lower powers more, to get the big picture, so to speak. I feel I have benefitted enormously from the binoviewer as a deep-sky observer, not been handicapped by it.
This says it so well! I couldn't put it better if i tried... so i won't.
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