Written by Sanne

What type of binoculars do I need?

You know for which activity you're going to buy binoculars. In addition to the situation, there are a number of other factors that you can take into account when finding the best binoculars for you. Below you can read what the difference is between the different prism types, whether the binoculars are suitable for people with glasses, and when they're waterproof.

Roof prism

Roof binoculars

Binoculars with a roof prism have lenses and prisms that stand right behind each other. This makes binoculars with a roof prism compact in size. Another advantage of this type is that you focus by moving the lenses instead of the eyepiece. This way no air gets into the binoculars. This makes it less susceptible to dust and water.

Porro prism

Porro binoculars

With binoculars with porro prism, the lens and the eyepiece are not aligned. The images are transported via an N-shaped bend. This makes the housing of this type of binoculars wider. An advantage of the porro prism is that it provides better depth perception. The disadvantage of the porro prism is that you often focus by moving the eyepiece. This allows dust and water to come into the binoculars.



A monocular is a binocular with 1 eyepiece and lens. This makes these viewers a lot more compact and lighter than the other types of binoculars. With this viewer you only look through the lens with one eye. This way you keep a close eye on the environment with your other eye. The disadvantage of a monocular is that you see less depth with it.

Are my binoculars suitable for people with glasses?

People with glasses

Whether binoculars are suitable for people with glasses depends on the maximum eye distance of the viewer. This means the distance from the eye to the binoculars. If you wear glasses, it's important that you don't have to keep the viewer's lens directly on your eye to see enough. A maximum eye distance of 15 millimeters is definitely recommended for people who wear glasses. This way you hold the viewer against your glasses without losing a field of view.

When are binoculars waterproof?

Waterproof binoculars

When you go to a wet destination like Scotland or the rain forest, it's important that your binoculars are waterproof. A roof prism ensures that the viewer is less susceptible to moisture. In addition, the filler of the viewer contributes to the water resistance. A binocular filled with nitrogen is very well sealed against external influences thanks to the slight overpressure. As a result, no water can enter the viewer to cause condensation.

Article by:
Sanne Binocular Expert.

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