*“Do you own a binocular but don’t know what the numbers which appear on it means? Well not always everyone knows everything and it is nothing to worry about. This article is all about binocular numbers. What do they mean, and why are they important? “*

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Binoculars are instruments designed to observe distant objects. Like any other instrument, they have their units of measurement and technical terms that may seem difficult at first. If we learn them, they are not that difficult.

Binocular numbers are usually specified as a set of numbers. Two digits them refer to binoculars and differentiate one model from another: for example, 11 × 50 mm or 12 × 42 mm.

## What Does The Numbers Spears On It Means?

In this article, you will get to know all about binocular Numbers. The numbers on binoculars indicate the magnification and size of the objective lens. For example, one of the most common magnifications and objective sizes is the 10×42 (spoken as 10-by-42).

The first number is called magnification. It indicates the power and how many times the observed images appear magnified. A 12 × 50 mm binocular will show us the objects (or subjects) 12 times closer, while a ten × 42 mm will have a power of 10 times.

The second number after the x is in millimeters. Indicates the diameter of the objective lens. A 12x50mm binocular will have a 50mm diameter objective lens; however, a 10x42mm will have a 42mm lens.

The size of the objective lenses is important as it keeps you aware of how large the binoculars are and, therefore, how much light they will need to collect to improve how well you can see.

## Binocular Magnification

Binocular magnification is sometimes referred to as power. The magnification of the first number of the binoculars shows how many times the images are close together or zoomed in therefore binocular numbers meaning is important to know about.

If the image appears larger to our eyes, the angle of view is narrow. When viewing with the binoculars, the vibrations of the hand can make the framed image unclear. With magnifications greater than 10x, a tripod generally has stable support and clear and detailed observation.

## Why Is Binocular Magnification Important?

The main purpose of binocular numbers meaning is to allow you to see distant objects more clearly by making them look larger as if you were seeing them from much closer. An “8x” binocular makes the object you are looking at appear eight times larger than it would if you look at it with just naked eyes.

Binoculars with 8×40, 8×42, 8×70, 8×32, or even 8×21 offer the same magnification. As shown here, the magnification and features of binoculars differ depending on how you want to use them.

**1. Lens Diameter**

The second number after the x indicates the diameter of the objective lens expressed in millimetres, which determines the amount of light collected and the size of the field of view.

Usually, binoculars with diameters not exceeding 50 mm are known as they are light and practical to carry.

Larger lens diameter = Greater brightness and visible details = Greater weight of the binoculars

**2. Field Of View**

The field of view is how much area you can view at once when looking through binoculars. The field of view represents the area you can observe with binoculars at a distance of 1000 meters and can be expressed in both meters and degrees.

The width of the field of view is inversely proportional to the magnification. Binoculars with 10x will have a greater field of view than 12x binoculars.

You can express the field of view using either degrees or meters. It is vast when it is about 60 degrees or more. Thus, selecting a binocular with a wide field of view makes it easier to observe fast-moving objects such as birds or viewing sports.

**3. Output Pupil**

Another value to consider while buying binoculars is the output pupil. Exit Pupil stands for the measurement of the circle of light that appears when you look through the binoculars while holding them at a short distance away from your eyes. It is expressed in millimeters which shows the diameter of the light beam that reaches the eye.

Exit pupil = Lens diameter / Magnification

The exit pupil is a parameter to be considered since it should be at least as wide as the pupil of our eye, which varies from 2 mm in bright light to 7 mm in low light conditions.

Greater exit pupil = Greater light transmission = Brighter images

## What is a Good Binocular Number?

Binoculars with a magnification of 6 to 10x are easier to use, but for birdwatching, tracking moving objects, and keeping shaking to a minimum, 8 to 10x magnification is best. Lower magnification is easier to use for theatergoing, and portability is an important factor.

## Which is Better: 12×50 or 10×42 Binocular?

The magnification power of a 12×50 is 12 times magnification (12 times larger than normal unaided vision). So the “zoom difference” would be an increase of 20% in the magnification from a 10×42 to a 12×50.

## What does 30×60 Binocular Mean?

The 30×60 will provide you with 8 x magnification. A 21 mm lens will provide you with a greater view to enjoy the landscape. It is focused enough to see a fixed object or point of interest, such as a turkey or a deer.

## Conclusion

Binoculars are instruments designed to observe distant objects. Binocular numbers are usually specified as a set of numbers. The first number is called magnification. It indicates the power and how many times the observed images appear magnified.

The second number after the x indicates the diameter of the objective lens expressed in millimeters, which determines the amount of light collected and the size of the field of view.

The field of view represents the area you can observe with binoculars at a distance of 1000 meters and can be expressed in both meters and degrees. We hope that this information about binocular numbers meaning will be handy for you while picking the best binoculars.

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