What Do Numbers On Binoculars Mean?

Reviewed by Dayna Hatmaker
Dayna Hatmaker

Dayna is a professional optician and has been working in this profession for 7 years. She truly understands her customer's optical needs and recommends the best product. She got her optometry degree from the University of Waterloo. Other than this, she loves golfing, fishing, boating, and hitting the gym.

What Do Numbers On Binoculars Mean

There is a common practice of mentioning the specific details (dimensions, power, and features) of the products on its surface. This practice becomes a mandate in scientific or astronomical products.

Various astronomical products and equipment have these details engraved over them, making it easier for the user to sort them as per the requirements.

So let us discuss some numbers you would find on your binoculars and what they signify.

Numbers on Binoculars


These are the least found engraved details on the surface of equipment because only a few binocular companies mention the details, such as dimensions on the surface. At the same time, you can find the dimension on the website where the product is listed or on the box of binoculars.


Magnification is the ability of a lens that makes it easier for a user to see a distant object easily. Each lens is made up of extremely high precision and well-calculated methods. It’s been noted that the angle of view is inversely proportional to the magnification of the image.

The magnification is noted with an X placed ahead of a number like “8X” or “10X”, which signifies that the binoculars can magnify the image eight times or ten times.

Objective Lens/Aperture

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After magnification, the most important thing is the size of the outward lens, the aperture mentioned on the surface, or the box of binoculars. This is often represented by 8X42, which would provide eight times magnification on a 42 mm diameter lens. People who want to use binoculars for professional purposes emphasise such features.

Field of View

Field of View

Each binocular has a certain angle to which users can extend their view; some binoculars can be manually adjusted, making it easier for users to enhance their field of view. So you can conclude that magnification of the lenses is inversely proportional to the field of view.


These are some crucial numbers and specifications mentioned on the box containing the binoculars. If you have a good idea about binoculars, you can easily choose the best one that suits your requirement. The magnification, dimensions, and aperture size allow you to choose the best product and its field of vision for the purpose it will be used.

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