Rifle Scope Numbers Explained: Magnification & Objective Lens

Introduction

Rifle scope numbers tell you how close your target will appear and how much light the scope can gather. If you don’t understand these numbers, it’s easy to choose the wrong scope for your shooting needs that can affect the performance of rifle. In this guide, you’ll learn what rifle scope numbers mean, how to read them correctly, and how they affect real-world shooting so you can avoid common beginner mistakes and pick the right scope with confidence.

What are Rifle Scope Numbers?

Rifle scope numbers show how a scope works. These set of numbers printed on the scope. They tell you how much the scope can zoom and how big the front lens is. Once you understand these numbers, picking the right scope becomes much simpler.

How to Read Rifle Scope Numbers?

On a rifle scope, you will see numbers written like 3-9×40.

The first part represents the zoom level. This scope can be used at 3x or adjusted up to 9x.

The second number shows the size of the front lens in millimetres. This affects how much light enters the scope.

Common Rifle Scope Number Examples

A 3-9×40 scope is a popular choice for many shooters because it works well in many situations. The lower end of the zoom is useful for close shots, while the higher end is useful for shots of a target farther away.

A 4×32 scope has one fixed zoom level, so there is no need to adjust magnification while shooting. It is a good fit for shooters who prefer a steady view and reliable performance.

A 5-20×50 scope offers higher zoom and a larger front lens. It is suitable for shooters who want more control at extended ranges. 

What is Rifle Scope Magnification?

Scope magnification tells you how much closer a target looks through the scope. It is written as a number followed by an “x.” For example, 3x means the target looks three times closer than it does to the naked eye.

Magnification is only one part of a scope’s numbers. Scope numbers are usually written as 3×32. The first number is the zoom, and the second number is the size of the front lens in millimetres. So a 3×32 scope has 3x zoom and a 32mm lens.

How Magnification Changes What You See

Inside a scope, several lenses make the target appear closer. The image is first magnified, but it is upside down. A second set of lenses flips the image the right way. Then the scope sharpens the view, making it clear to your eye. This all happens as soon as you look through the scope.

Fixed vs Variable Rifle Scope Magnification

A fixed magnification scope has only one zoom level. You can’t change it, which makes it simple to use. It is simple, reliable, and easy to use. Many shooters like fixed scopes because there are fewer adjustments to manage.

A variable magnification scope lets you change the zoom level within a set range, such as from 3x to 9x. This is useful for shooting at different distances. It does mean you need to pay a bit more attention while adjusting the zoom.

Practical Effects of High and Low Magnification

Higher magnification makes small or distant targets easier to see, but it also narrows your view and can make movement feel more noticeable. Lower magnification gives a wider view of the area around the target and often feels more stable. Brightness can also change with magnification, as higher zoom levels usually allow less light to reach your eye. Choosing the right level is about balance, not maximum power.

Selecting the Right Magnification for Your Shooting Distance

Scope Magnification Guide by Range and Distance

The right magnification depends on how far you want to shoot and what kind of target you are aiming at. Low zoom works best for close shots, giving a wider view to follow moving targets. High zoom makes far-away targets easier to see, but shows less around them.

The table below lists common zoom levels, the distances they are best for, and the types of shooting they suit.

What is Objective Lens?

The objective lens is the front lens of a rifle scope. Its job is to gather light and send it to your eye. How much light it collects affects how bright and clear the target looks. Lens size can make a noticeable difference, especially in low-light conditions like early morning or late evening.

How Objective Lens Size Affects Brightness

Objective lenses are measured in millimetres (mm), usually between 32mm and 56mm.

• 32mm lens: Small and lightweight. Works well in daylight but may appear dim in low light.
• 40-44mm lens: A good balance of brightness and size. Works for most hunting and range shooting.
• 50-56mm lens: Lets in the most light for brighter images in dim conditions. Makes the scope heavier and larger.

Why Larger Objective Lenses Are Not Always Better

Bigger lenses bring in more light, but they also add weight and bulk. They can stick out, making the scope harder to mount, and usually cost more. Mid-sized lenses often give the best mix of brightness, weight, and ease of use.

How Magnification and Objective Lens Size Work Together

Magnification and objective lens size both affect what you see through a scope. Zoom tells you how close a target looks, while the front lens controls how much light comes in. Using them together correctly helps you get a clear, bright view at the distance you need.

Choosing the Right Combination for Your Use

For close-range shooting, a low zoom with a small lens is enough. It keeps the scope light and easy to handle. For medium distances, a moderate zoom with a mid-sized lens works well. It gives a clear view without adding too much weight. For long-range or low-light shooting, a higher zoom with a bigger lens helps you see far targets clearly. It does make the scope heavier.

The best approach is to match zoom and lens size to your shooting needs, so the scope feels comfortable and shows the target clearly.

Conclusion

Understanding rifle scope numbers and objective lens sizes makes choosing the right scope much easier. Magnification tells you how close your target will appear, while the objective lens controls brightness and clarity. The best results come from matching zoom and lens size to the distance you shoot and the type of targets you aim at.

If you’re looking for a reliable rifle scope that fits your shooting style, explore the options available at Feyachi. You can find scopes designed for different distances, lighting conditions, and skill levels to match your needs.

FAQs

What Magnification Is Best for 100 Yards?

A scope around 3-9× works well at 100 yards. Lower zoom makes it easier to spot and follow the target, while moderate zoom helps you aim more precisely. Many shooters find 4-6× a comfortable range.

Does a Larger Scope Objective Size Always Mean Better Performance?

Not always. A bigger lens lets in more light, which can help in dim conditions, but it also makes the scope heavier and bulkier. Mid-sized lenses usually give the best balance of brightness, weight, and ease of use.

What is the Best All-Around Rifle Scope Magnification?

For general use, a 3-9× or 4-12× scope works best. It handles both close and medium-range shots, making it a reliable choice for most hunting or target practice.

What Magnification Do I Need For Deer Hunting?

Most deer hunters use 3-9× or 4-12× hunting scopes. Low zoom works well for shots at closer ranges, like in forests or thick fields, while higher zoom helps for open areas or longer shots.

What is the Difference Between 40mm and a 50mm Objective?

The 50mm lens lets in more light than a 40mm lens, which makes the image brighter in low-light conditions. A larger lens is heavier and bigger, while a 40mm lens is lighter and easier to handle. The choice depends on whether you need more brightness or a lighter scope.