How Do You Measure the Strength of Monoculars? – Complete Guide with FAQs and Mor

Are you wondering how you measure the strength of monoculars?

Let’s find out.

How Do You Measure the Strength of Monoculars?

If you look at an optical instrument’s specifications, you will always find two numbers.

For example 8×25. The first one represents its power (8 times), and the second one has its focal length (25 mm).

An optical instrument will normally have a focal length between 20mm and 42mm.

How to Choose a Monocular?

Monoculars are smaller than binoculars but they’re not necessarily less powerful. They’re usually lighter and easier to carry around. Here are some tips on choosing the right monocular for your needs.

What is a Good Monocular Power?

The first thing to look at when choosing a monocular is its power or magnification. A monocular will typically have a magnification of 6x to 10x – a higher magnification will allow you to see further and in more detail.

Binoculars typically offer better image quality than monocular telescopes. However, they’re larger and heavier than monocular telescopes. Monocular telescopes tend to be cheaper than binoculars.

What is the Right Lens Size?

When looking at a monocular’s specifications, you will always see 2numerals. For example, 8×25. The first numeral represents its magnification (8x) and the second its focal length (25mm).

Monoculars usually come with lenses between 20 and 42 millimeters. Larger lenses will give you a wider field of vision. Bigger lenses will also produce sharper images when using them.

The downside is that larger lenses mean heavier and bulklier monoculars.

Monocular Size and Weight

Compact/Pocket Monoculars: These monoculars are usually smaller than a 7×50 binocular. They’re easy to carry around and they’re small enough to fit into your pocket.

It comes with a small carrying case so you can easily take it anywhere. You can use it in your car or in the back of your truck when driving.

Pocket monoculars may be cheaper than binoculars, but they’re not necessarily better.


Don’t be disappointed if you don’t get great results out of an 8×25 or 10×25 pocket monocular. They’re powerful enough for most situations, but they have a very limited field of view.

To start off, you’ll want to determine which subject you’d like to photograph. Then, using the monocular in a “point and shot” fashion, take pictures of the subject.

To get a wide, sharp, and bright image, choose a 30–42 millimeter monocular.

Monocular vs. Spotting Scope

Monoculars are usually small and light, but larger ones with more power, bigger lens, and wider view are called binoculars.

Monoculars are usually smaller and lighter than binoculars. They’re typically used for observing wildlife from a moving vehicle or hiking through the woods.

If you want better performance but don’t care about the weight or the price, then you should get a spotting scope.

Best All-Around Monocular

Avalon 10×42 WP Monocular

Avalon’s has the best combination of performance, size, and lightness. It’s not your typical pocket monocular.


This is a relatively compact monocular but still allows you to enjoy the power and wide view of a full-sized binocular.


It weighs just 320 grams so it fits easily into your jacket pockets.


It has fully multi-coated lenses and delivers a clear picture even in low light conditions.


It is also completely waterproof and fog-resistant.


The rubber armored body makes this monocular durable and easy to grip.

Eye Relief

Another great thing about the is its long eye-relief. This means it can either be worn with or without glasses.


You can also turn the eyecup to fit your vision.

How Do You Measure the Strength of Monoculars? - Complete Guide with FAQs and More

How Do You Measure the Strength of Monoculars?

Frequently Asked Questions (FAQs)

What is Exit Pupil Size?

For 8×42 Binoculars, 42/8 equals an exit pupil size of 5.25mm (1/4 inch).

How to focus binoculars?

To focus your binoc­u­lar lenses, follow these steps.

  1. Focus the camera on a distant object by covering its left lens with a lens cover and then focusing the center control on the object.
  2. Turn the right lens into the left eye and sharply focus the dioptric control on that same object using the right eye.
  3. You’re finished; keep the diopter at its current setting and use the center focus ring for all adjustments.

What are the numbers on binoculars?

On binoculars, model numbers basically tell you their strengths (magnifications) and sizes (objective lenses).

What is Objective Lens Size?

Objectives lenses give you an idea of how large the binoculars are, and how much they can gather.

What are the Best Binoculars for Outdoor Use?

Binocular lenses come in different sizes and weights. You’ll want compact binocular lenses with a maximum power of 8 or 10 and a minimum objective lens diameter of about 28mm.

What is the Field of View Spec?

This specification states the width of the field of view you can see at one thousand yards. It doesn’t state anything about the actual size of the area you can see. You may be able to see an object that’s much larger than 1,000 yards away if you use binocular vision.

What is the Best Way to Choose a Pair of Binoculars?

To get an idea of the optical quality and ease of use of binoculars, visit a store and look at several pairs before making a final decision.


A monocular is an optical instrument that allows one person to see both near and far objects simultaneously. They’ve been in existence for many years.

Early monoculars were usually constructed using two pieces of transparent material (such as clear plastic) that were held together by some sort of clamping mechanism.

Early monoculars were cumbersome, difficult to use, and had limited magnification power because their lenses could not be changed after assembly.

If you have any queries feel free to ask in the comments below.


  • John Moses

    John is the Editor in Chief here at The Outdoor Stores. His area of expertise ensures that there is no one better to suggest which rifles are most suitable for your hunting experience. He is also available for you to contact him personally to discuss the types of animals you want to hunt and the terrain you will be hunting on. Feel free to read his posts for expert opinion on Rifles, Scopes, Rangefinders, Bonoculars and Monoculars.

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