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FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 07 Aug 2017 (Monday) 11:30
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Question about Canon's new IS binoculars for stargazing

 
Perfectly ­ Frank
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Post has been edited 2 months ago by Perfectly Frank.
Aug 07, 2017 11:30 |  #1

Canon has released 3 new binoculars that have improved image stabilization.

I'm interested in them for stargazing. They all have a 32 degree field of view, but come in different magnifications:
10x32, 12x32, 14x32. How important is magnification for stargazing? Should I just go for the highest power?

https://www.usa.canon.​com ...ulars/20170802-Binoculars (external link)


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Aug 07, 2017 14:23 |  #2

No help here, but I'm wondering if the field of view is the same, wouldn't the magnification be the same?


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john ­ crossley
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Aug 07, 2017 15:28 |  #3

Perfectly Frank wrote in post #18421277 (external link)
Canon has released 3 new binoculars that have improved image stabilization.

I'm interested in them for stargazing. They all have a 32 degree field of view, but come in different magnifications:
10x32, 12x32, 14x32. How important is magnification for stargazing? Should I just go for the highest power?

https://www.usa.canon.​com ...ulars/20170802-Binoculars (external link)

No they don't.


10X32 Real Field of View 6.0° Apparent Field Of View 55.3°
12X32 Real Field of View 5.0° Apparent Field Of View 55.3°
14X32 Real Field of View 4.3° Apparent Field Of View 55.5°


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Post has been last edited 2 months ago by CyberDyneSystems. 5 edits done in total.
Aug 07, 2017 16:20 |  #4

the 32mm in this case, or the 2nd number in all binocs, = the diameter of the front/objective lens element.

This is the limiting factor of how much light the binocs let in. It is the measurement used for a binoculars aperture. You do not get a ratio like we do with f/stop on camera lenses, just the original objective lens mm.

You can still compare to the aperture rating on a camera lens,. in that is gives you an idea of the light gathering ability.

However it is obviously more directly related to the front element of a camera lens, which in ratio with the magnification, results in the aperture f/stop value of a camera lens. In both cases the larger the front element, all else being equal the more light, (and usually more detail.)

With all three of these new binocs having the same 32mm, the one with the lowest "X" rating, ie: the 10x, will have the best light ratio,. essentially the largest f/stop.

In camera lenses, a 200mm f/2.8 will have the same diameter front element as a 400mm f/5.6.
The same amount of light went in to both, but double focal length of the 400mm will half the f/stop.

I am simplifying the terms of course.


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Perfectly ­ Frank
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Aug 07, 2017 18:31 |  #5

john crossley wrote in post #18421533 (external link)
No they don't.

10X32 Real Field of View 6.0° Apparent Field Of View 55.3°
12X32 Real Field of View 5.0° Apparent Field Of View 55.3°
14X32 Real Field of View 4.3° Apparent Field Of View 55.5°

Thanks for the correction. Canon shows this info on the spec page.


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Perfectly ­ Frank
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Aug 07, 2017 18:46 |  #6

CyberDyneSystems wrote in post #18421588 (external link)
With all three of these new binocs having the same 32mm, the one with the lowest "X" rating, ie: the 10x, will have the best light ratio,. essentially the largest f/stop.

Thanks for the comments, CDS.

10x for the best light ratio would benefit stargazing. I also think the 10x32, having the largest real fov (6.0 degrees), would be the best choice,
since it allows the user to see more stars and celestial objects through the eyepiece. I believe stargazers value large fov over magnification.
But I want to see what other stargazers have to say.


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Question about Canon's new IS binoculars for stargazing
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