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Advice for choosing good binoculars

What happens at a long distance, you bring closer. With a good binoculars you can observe everything. Do you want to spot birds, watch stars or experience a theatrical performance from up close? A suitable binoculars can be found for every situation. On this page you will also read what the numbers and technical terms mean. We also explain the difference between binoculars, a porro prism binocular and a monocular. And do you know what makes a binocular really good? Below you will read which binoculars best suit you, your situation and your needs.

What do the numbers on binoculars mean

What do the numbers on binoculars mean?

On binoculars you always see 2 numbers, for example 10x25. This means that the viewer enlarges the image 10 times and it has a 25mm diameter lens. The higher the first number, the more the image is magnified. The second number means that a large lens lets more light enter, giving you a brighter image.

Moreover, it does not mean that a high magnification number is always better. With a high magnification, the smallest movement already has consequences. The visible image is not only magnified, the vibrations (which you often cause yourself) are increased as well. With a magnification above 8, your brains are less able to compensate for the vibrations in the image. You need a steady hand or a tripod.

What do the technical terms for binoculars mean?

What do the technical terms for binoculars mean?

There are many technical terms in binoculars. This does not always make it easier. To help you out, we have explained the most commonly used concepts. This way you are well aware of all technical terms. By technical term, you will read what it means, what it serves, and how to calculate the different values.

The exit pupil is important when using the binoculars in the dark. The dusk number is relevant if you use the binocular when it gets dark. Would you like to know how clear the image is? Then read more about the light intensity. The width you can see with the binocular is called the field of view. It is also useful to know more about the actual angle of view and the apparent angle of view.

What types of binoculars are there?

What types of binoculars are there?

The type of prism in a binoculars is the main distinction between the types of binoculars. The front lens rotates the image. The prism corrects this and resets the image. There are 3 types of prisms: roof, porro, and monocular. But what exactly is the difference? And what are the pros and cons?

With a roof prism binoculars, the lenses and prisms are placed right after each other. With a porro binoculars, the lenses and prisms are shifted relative to each other. Porro binoculars are therefore wider. A monocular is a binoculars with 1 eyepiece and 1 lens. You look through the viewer with one eye. Monoculars are therefore a lot more compact and lighter than the roof and porro binoculars.


What is a good binoculars?

Finally, when choosing a good binoculars, you have to pay attention to the quality. This is determined by the coating, the material and the firmness. The coating is by far the most important.


All modern binoculars are fitted with coatings. A coating is an extra layer on the lenses that can bring about some improvements. The main advantage of these layers is higher light transmittance - up to 50% - and therefore a much better image. Especially under poor lighting conditions such as fog, dusk or rain, the result is visible. Without coating the lens parts are fogged and the image becomes foggy and dark. Binoculars feature coatings to prevent glare, allowing you to keep seeing through your binoculars. In addition, coatings provide an increase in contrast. That gives a calmer image, making you look through the binoculars in a relaxed manner.

Glass and firmness

The glass also determines the quality of the viewer. A top coat on a glass of lower quality is a waste of money. Types of glass are for example: crown glass - such as BK7, Bak-4, and Flint glass and with extra low-dispersion glass, you prevent chromatic aberration.

Finally, it is very important to experience how the binoculars feel in your hand. It's personal and situation-dependent whether you want a lightweight or a heavy and robust viewer.

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