What Do The Numbers On Binoculars Mean?

Understanding the numbers on binocular can be tough when you are just playing around & be like what do the numbers on binoculars mean?

However, before buying any binoculars, we must go after the numbers. It doesn’t matter if it is the number of prices, the number of magnifications, several optics, or something else. Numbers play a vital role in any activities we do online or offline.

What Do Numbers On Binoculars Mean

A number can contain much-hidden information within itself that you must know before purchasing any binocular online.

A combination of a few numbers you see while purchasing binoculars is mostly listed below. Along with a little explanation of their existence.

Check our guide on binocular parts & functions.

what do the numbers on binoculars mean?

Below is a detailed guide about the numbers in binoculars in a listed manner.

1) Field Of View and Angle of view

This is the amount of wide-area that a binocular can capture when viewed through it. This could be either expressed as an angle or feet/meters per 1000 yards/meters. The higher the number, the wider area you can view through it.

You must note that if you want to view or cover more area, then you need to buy a binocular that has the lower magnification. Because higher magnification can ultimately minimize your viewing area as it brings objects closer to you.

If you have an angle of view (suppose x degree) given in your binocular, then to find out the entire field of view, you need to multiply it by 52.5.

Let’s take an example, and you have 7.2 degrees of angle of view, then by multiplying it with 52.5, you’ll get a 378 feet field of view.

This number is usually measured either in linear feet at a distance of 1000 yards or in angular degrees. The wider field of view has so many advantages but not limited to, finding any creatures in the denser background and following fast-moving objects.

2) Magnification

This can also be termed as objective lens size or aperture. This is a combination of two numbers with a multiplication operator, which is termed as ‘by.’

An example of a magnification number is 9 X 40. This means that any binocular having this number can easily magnify an object Nine times closer than their actual distance. 

Higher magnification can cause instability and unclear image. If you have something to hold a highly magnified binocular such as any stand and if you’re in a lightful destination, then there shouldn’t be any trouble.

Minimum zoom can be great to spot any flying creatures or any land being. Once you spotted them, then you can use the advantage of highly magnified binoculars to see more details.

3) Eye Relief Number

This number is significant for glass wearers. This number represents how far you can keep your eye away from the eyepieces and still watch the full view without missing any beauties around. 

If the eye relief number does not match with your glass, then it’s a total waste of buying. You won’t be able to see the whole images except the central part of the photos.

There are two kinds of eye relief numbers you should consider before buying any binoculars. Regular eye relief numbers range from 9 to 13mm. Specially designed long term eye relief numbers range from 14mm or above.

Generally, eyecups are folded down for glass wearers so that there won’t be any difficulties for them to see the objects closer. However, many cases are like this where the users don’t get satisfied with the closeness of the objects.

In such cases, you need to buy specially designed long term eye relief numbers ranging from 14mm or above binoculars.

This number is making it possible to see the images you’re focusing on. If this number is higher, then it’ll be better for us to focus on anything we want without compromising the quality.

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To see how it’s possible to see the images and to focus. Hold your binocular about 8 inches away from your eyes, and then in the center, you’ll see two dots.

That dot is the point from where the light hits the lenses and enters our eyes and makes things possible to see and analyze with the binoculars we have.

4) Exit pupil numbers

This is another important consideration to determine when buying a binocular. Some numbers make it possible to view the objects even in low light.

Bigger numbers mean more clarity when viewing objects through it. To find out how it is possible to view objects through a binocular. Take your binocular about 8 inches from your eye.

You’ll see two dots at the center of the eyepieces. This is the point where the light hits the lens and enters your eyes.  This number can also be considered as the diameter of the beam of light leaving the eyepiece.

5) Close Focus

This is the most important factor to consider when using binoculars. This number makes it possible to focus on any object we want to. A short example of this number is:

Suppose the close focus of any binocular is 8 feet then you can focus on any object as close as 8 feet and bring it to you.

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So, its time to wrap up in a summary. Here’s a video that summarises all the points mentioned above.

So, This was all about what do the numbers on binoculars mean. Have any questions in mind? Feel free to comment.

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Reference: https://www.explainthatstuff.com/binoculars.html

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