What Is Eye Relief on Binoculars? – In-Depth Guide with FAQs, Pro Advice, & More

There are so many questions related to binoculars.

Let’s answer them in this article.

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Eye Relief in Binoculars

Binoculars have different eye reliefs. You must be careful when choosing a binocular because each eyepiece has a specific eye relief. For example, if you choose a binocular with an eye relief of 15mm, then you should put your eyes at 15mm away from the eyepiece.

Your eyes must be at the right distance from the screen. If your glasses prevent you from getting your eyes close enough, you may miss out on some of the pictures. You may also lose the Great Blue Heron.

A person who looks far away sees a small part of the whole picture. He or she might be looking at something important, but he or she doesn’t know what it is.

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Long eye relief

Binoculars come with eyeglasses that you can pull out or twist to adjust the length of the eye relief. You also need binoculars with a long eye relief if you wear glasses. Your glasses should be able to slide into the binoculars easily without getting stuck.

What is good eye relief?

Binoculars should be used by people who wear glasses. Eye relief is the distance between the eyepiece and the edge of the lens. A binocular with more eye relief allows you to see farther without having to move your head.

Binoculars are used to view distant objects. You should try them out before buying them. Try looking through them with your glasses on and then with your glasses off. Don’t worry about focusing.

Eye relief is an important specification when buying binoculars. You should measure the distance between the eyepiece and the eye socket of your face.

Manufacturers usually specify this value in millimeters (mm). However, there are other ways of measuring eye relief. For example, some manufacturers use the term eye-box instead of eye relief. This measurement is also expressed in mm. If you want to be sure about eye relief, you should measure it yourself. To do this, hold the binoculars up to your eyes, then move them back and forth until the image disappears. Then take note of how far away the image appears before disappearing.

Eye relief and exit pupil

Eye relief is the distance between your eyes and the lens of your camera. When you take pictures, you want to make sure that there is enough space between your eyes and the front of the lens to allow you to move your head around freely. This means that if you’re taking photos of people, you need to make sure that the person isn’t right up next to the lens. You also want to make sure that when you zoom in close, the subject doesn’t get cut off by the edges of the frame.

Binoculars have an exit pupil width of 4.2mm/10×42. Doubling the magnification to 20x increases the exit pupil width to 2.1mm/20x. This means that you need to focus closer when using a zoom lens.

Optics showing eye relief and entrance pupil 1 Real image 2 Diaphragm 3 Eye Relief 4 Exit Pupil

Eye relief is important because if you shoot someone with a scope, your eyes could get hurt. Your eye should be far enough away from the scope so that the recoil doesn’t push the scope into your face.

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Available eye relief

Eye relief is the distance between your eyes and the lenses of your glasses or contact lenses. For example, if you wear glasses, the distance between your eyes (the eye relief) and the lenses of your eyeglasses is called eye relief. You may be able to see more clearly by wearing contacts instead of glasses because the lenses are thinner than the lenses of eyeglasses. However, some people who wear contacts still need to use eyeglasses because the lenses of the contacts are too thick.

Spectacle wearers should wear their spectacles close to their eyes. Opticians should test the distance between the lenses and the back vertex of the spectacles.

How to get the Right Eye Relief Adjustable Eye Relief

Binoculars are some of the optical instruments that come with adjustable eye relief. Eyeglasses users can use them comfortably when the eyecups are adjusted properly. But if the eyecups are twisted out, the same glasses user will have to strain their eyeballs to be able to see everything in the field of view.

Eyecup extension is an important part of wearing glasses.

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Long Eye Relief

Binoculars with long eye relief allow for more forgiving distances. Those who wear glasses can comfortably use binoculars with long eye relief. Binoculars with long-distance focus are usually designed with short eye relief.

Short Eye Relief

Eye relief is something that most people don’t think about when buying a gun. However, if you’re looking for a new handgun, make sure that the eye relief is at least 13mm. Otherwise, you may feel like you’re trying to strain your eyes to see the whole field of view.

Eye relief refers to how far away from the screen your eyes should be placed. When you’re looking at a computer monitor, you want to be as far away as possible without causing discomfort.

Minimum Eye Relief for Glasses

Eye relief refers to how far away you need to be from an object before your eyes start getting blurry. Typically, the eye relief distance recommended by manufacturers is 16mm or more for comfortable viewing (16-20mm). Binoculars usually have eye relief around 15 to 17mm.

Optical instruments that have eye relief include binoculars, rangefinders, spotting scopes, riflescopes, handgun scopes, scout scopes, and rifle scopes.

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Eyecups and wearing glasses

Eyeglasses are attached to the ocular barrel by means of an elastic band. This allows us to adjust the length of the eyeglasses. Eyeglasses are used to correct vision problems or to protect the eyes from harmful rays.

Eye relief is the distance between the front of the lens and the point at which light rays first begin to diverge. This is usually measured in millimeters (mm). For example, if you were looking at a distant object with a 50 mm lens, your eye would be about 50 mm away from the front of the lens. If you were looking at something closer than this, such as a person standing next to you, then your eye would be further away from the front of your lens.

what is eye relief on binoculars

What Is Eye Relief on Binoculars?

Minimum Eye Relief

Most binoculars have an eye relief of 12-15mm. Binoculars with longer eye relief work better for people who wear glasses. Premium binoculars have eyepieces with long eye relief.


We hope that you have a better understanding of what eye relief is.

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