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Binocular seeing distance

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2012 at 16:48
darrelj View Drop Down
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My need for a Binocular is to watch cricket matches. I wish to get a view of the players in the middle of the ground at close range.
What must I look to find a binoculars capability of bringing far distant objects closer?
I have seen something like 65m @1000m , someone said that this meant that a object 1000m can be seen as it is 65m away from you. Is this right?

Cheers
Darrel

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/03/2012 at 21:30
Klamath View Drop Down
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Originally posted by darrelj darrelj wrote:

My need for a Binocular is to watch cricket matches. I wish to get a view of the players in the middle of the ground at close range.
What must I look to find a binoculars capability of bringing far distant objects closer?
I have seen something like 65m @1000m , someone said that this meant that a object 1000m can be seen as it is 65m away from you. Is this right?

Cheers
Darrel

It is kind of hard to get a handle on what you are really getting at with the terminology of "seeing distance".  You can usually get that sort of basic information off of the binocular itself.  For example the glass may be labeled 8x42.  The first number is the magnification, 8x, brings the object 8x closer.  The second is the size of the larger objective lenses, in this case 42 mm.  The larger the objective, the better it will be in low light because the larger lens catches more ambient light than a smaller one.  Larger objective lenses also mean larger and heavier designs, the instrument may become too large depending on your personal preferences. Daytime Cricket matches should need no more than 8x, in fact 6x may be better. 
 
Your description of "something like 65 m at 1,000 m" refers to the field of view.  In other words, how much area is visible across the edge to edge dimension at a particular distance.  In your example, your view would be 65 meters wide at 1,000 meters distance.  That is about half what you would expect from many designs.  The fov is sometimes expressed in degrees.  For example it may be something like 8* field.  Each degree is 52.5 feet at 1,000 yards, or 17.5 meters at 1,000 meters.  A binocular is usually considered wide angle if the apparent field of view is 60* or more.  The easy way for apparent field of view is just to multiply the magnification by the angular degrees of field.  With 8* field an 8x binocular will have a 64* afov.  No, it is not correct that in your example an object at 1,000 meters will be as if it is 65 m from you.  How large the object is is s function of the magnification.  With an 8x binocular, the object viewed at 1,000 meters will seem to be 125 meters away.  So my advice for now is 8x or less with no more than 42-43 mm objectives.  What is available is largely dependent on what you want to spend.  I'd also get as wide a fov as you can.  A nice small porro prism like the Leupold Yosemite in 6x 30, a Nikon Action 7x35, or a Vortex Raptor in 6.5x 32 would be good choices for not a lot of money, if that is a concern.


Edited by Klamath - January/03/2012 at 21:48
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/04/2012 at 01:15
darrelj View Drop Down
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Hi, this is an excellent reply and explanation. I will read this over and over and get back for further clarification if needed.
Thank you so much
Darrel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/04/2012 at 07:48
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Darrel,
 
Klamath did give a wonderful explanation of the subject. To add to that.....
 
You mentioned wanting to bring the players in your cricket match closer. The higher magnification a binocular has the more likely you are to achieve your goal. So, theoretically, if you had a 12x or 15x binocular then you would be able to see the action much closer. The problem arises then that the higher in magnification you go then the narrower the field of view is and the more difficult it is to hold the image steady.
 
This would follow Klamath's advice to not go higher than 8x as this is a good compromise between acceptable magnification plus a reasonably wide field of view (the latter is going to depend on which particular model you choose as there are 8x42s which have a 330 foot field of view and ones that have a 430 field of view).
 
From past experience I typically see many lower power models referenced as excellent for sporting events. Configurations that are typically mentioned include 6x30s and 7x35s. Klamath's recommendation of the 6x30 Yosemite would fall along these lines as would the Nikon Action and Action EX 7x35.
 
Hope this clarifies things a bit further.
 
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