What do the numbers on binoculars mean

What do the numbers on binoculars mean

Last minute travel shopping plans in the making? Do not forget to add binoculars to the list if you will be going sightseeing and do not want to miss any beautiful views. You might also want one to see the beautiful stars adorning the night sky up close. But before you get a particular pair, it is important to consider the various binocular specs, including understanding binocular numbers.

Here is a small guide to help you understand these numbers so when you are buying binoculars, you can get the best binoculars possible.

What do the numbers on binoculars mean

The numbers on the binocular are basically the binocular’s configurations. You will see two numbers that are separated by x. The first number is the magnification, and the second is the objective lens size. The x between the numbers is for describing the magnification power.

For instance, if the number on the binocular is 7 x 35, 7 is the magnification power, and 35 is the objective lens diameter.

Binocular Magnification

The first number on the binocular is the magnification power of the binocular, for instance, 7×35 or 10×50. As explained earlier, the first number, i.e., 7x and 10x, indicates how much magnification the binoculars have.

The number implies that a 7x magnification will make an object appear 7 times closer than it actually appears to the naked eye. So as the number gets higher, the object will appear closer through the binocular lens.

However, the image will not be very steady with high magnification binoculars, 12x or more. If you want a steady image, you may need to position the binoculars on a solid surface like a wall or table to stabilize them. There is also the option of zoom binoculars which allow you to adjust the magnification according to your requirement.

Objective lens diameter

After the binocular magnification, we have the objective lens size, which describes how much light the lens can gather. For instance, a binocular with 8 x 40 will have an objective lens size of 40mm. Larger objective lenses will also mean a bigger size of the binoculars.

A larger objective lens has more light gathering ability. You will be able to see a brighter image as the lens will gather more light. Lens size is hence an important number, particularly for viewing the night sky or for instances when light is low. For instance, consider the night vision binoculars, which are used for stargazing or navigating in the dark, and hence need to have a superior low light performance.

For instance, if you are choosing binoculars for looking at the stars in the night sky and your options are 10×50 and 10×25. Which one should you opt for?

The answer to this is 1ox5o. Since the lens will be larger, you will be able to see far-off things in more detail and distinctively.

If you go to youtube, you can find a few cool videos that go into more details, like these two: