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eye piece center to center

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eye piece center to center

Postby Rocklock on Wed Aug 24, 2011 5:57 pm

I am having difficulty finding binoculars that open wide enough for my eyes. Application is mostly hunting and trying to get 4.2-5.5 mm exit pupil. Any insight? is there a measurement that can be searched?

thx
TC
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Re: eye piece center to center

Postby Rocklock on Wed Aug 24, 2011 8:08 pm

OK, found a term that I believe addresses the question - Interpupillary distance = is this the measurement? One showed 60-7mm, is this the "Normal"?
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Re: eye piece center to center

Postby Jne_K on Thu Aug 25, 2011 8:51 am

Hi

Yes, that is called interpupillary distance IPD - the distance between the pupils of your two eyes. An IPD on binoculars is typically between 54mm - 70 +mm, say, up to 74mm. Anything more is tough to come by in a full size binocular. Double hinged folding compacts will be your best shot at going more, but, of course, you lose that all important exit pupil.

The biggest hassle on IPD is that it is not a commonly listed spec by the bino manufacturers. First step, though, is to find your IPD in mm. This is easily done by stopping at an eyewear shop and having it measured or getting a ruler in mm and have someone measure it for you. If you need more than 74mm, selection will be very limited. Of all the bino manufacturers, Steiner is the best at listing their IPD and, of course, they are a very well known name in hunting binoculars. Take a look at the Steiner C5 with 75mm IPD
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