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How to focus your binoculars

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/06/2005 at 12:21
Chris Farris View Drop Down
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Common Center Focus Binoculars 

To focus your binoculars, begin by moving the eyepieces closer together or further apart until they are comfortable in front of your eyes and you are seeing one large round field of view.  Make sure that the right eye diopter focus* is set to ZERO.  Close your right eye (or obstruct your right eye's view by putting the right objective lens cover over the objective lens) and look at a distant object using your left eye.  Focus the distant image by turning the center focus ring.  Next, close your left eye (or obstruct your left eye's view by putting the left objective lens cover over the objective lens) and look at the same object using your right eye.  Focus by turning the right eyepiece diopter ring.  Once both sides are focused for your eyes, use the center focus ring to focus on objects at different distances and never turn the right eye focus again.  Make a note of your diopter setting and quickly focus any binocular by turning the right eye diopter focus to your setting. 

*right eye diopter focus may be located in a different location.  Most binoculars have the focus located at the right eye ocular lens, some have it located as an extension of the center focus wheel.



Edited by Chris Farris - April/08/2009 at 09:13
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2005 at 08:01
Rusty View Drop Down
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Chris,

 

Regarding Indexed right eye diopter focus:

 

What if the right barrel is indexed, and your optimum focus is between the two indexes.  I have an older pair of Pentax DCF WP, that I have to change the right barrel for close focus and distance images. 

 

Thanks,

 

Dean

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2005 at 14:39
Chris Farris View Drop Down
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If the right eye focus won't stop between the two marks then I guess you'll have to pick one.

 

You should not have to change the right eye focus just because you are looking different yardages.  Do you wear glasses or contacts?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/26/2005 at 08:02
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Chris,

 

I can't figure out why this happens.  I do wear reading glasses.   Do you think this could possibly affect the close/distance focus?

 

Rusty

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/17/2005 at 12:54
Chris Farris View Drop Down
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Yes it could affect the way the binoculars perform for you.  Have someone else try them that has 20/20.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/13/2007 at 02:20
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Since I started wearing glasses, I've found that to be true.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/22/2007 at 17:37
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I would think bifocals, or trifocals or especially progressive lenses in your glasses would drive you crazy trying to dial in your binocs!
The brain subconsciously moves your head to the right point when looking thru such glasses as you learn where the sweet spot is in your glasses for the object and distance you are looking at.... but when looking thru binocs, all the rules change and I would imagine you would get many headaches trying to get used to using glasses with altered lenses such as progressives. At least by taking your glasses off, your eyes would be more consistent, even if your uncorrected vision is bad.

If your not into lasix, they have really improved contact lenses now.....also,  if you only use glasses for reading and not distance, you shouldn't wear them when using your binocs, the adjustment should correct for your eyes if you follow the above procedure for dialing them in.

If using glasses with binocs is a pain, try not using them and letting your binocs do all the work..... you may find they correct for astigmatism problems too more than you think.


Edited by windstrings
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/14/2009 at 09:21
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Good tips. I also got a "bino loc" for my bino. It keeps them hinged at just the right angle for the best views
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/14/2009 at 10:06
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I do what windstrings suggested.  I drop my glasses down when using binos.  Leave them on when sighting through a scope.
 
Second nature now, not  a big deal.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/14/2009 at 11:41
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..............as long as you don't drop your pants down while sighting through the scope and leave them up when you're not supposed to.....Shocked
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/14/2009 at 20:32
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Pants are important when glassing. I have never been able to glass consistently while sitting down without them.

Chris's advice is good. However, some people have done really well with a technique I worked out:

After "bending" the binocular so your eyes are centered in each eyepiece, close your right eye and then use the center-focus to focus. This focuses the binocular to your left eye. Then open your right eye and look throthe binocular while fiddling with the diopter adjustment until the view through both eyes appears sharp.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/15/2009 at 10:23
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/16/2009 at 08:28
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I know about progressive lenses being a pain - you ought to try them with transistion lenses. When out hunting in bright days I can't see squat - look like I'm wearing a pair of Ray Bans. I'm going to get a single persciption lens just for hunting this fall.
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