What You Need to Know About Rifle Scope Objective Lens Diameter

How important is the rifle scope objective lens diameter? Read on to learn more about the objective lens diameter and how it affects your rifle scope.

When you are choosing a new rifle scope, you have to consider many things before you make your choice. You need to make sure that you are getting a durable and rugged scope that is built to last, one that has a quality turret system, and that has excellent optics. You will also likely want to know about the rifle scope objective lens diameter.

The objective lens diameter is often one of the first things that people look at when they are considering a new scope for their rifle. People want to know the overall size of the objective lens, and they want to know just how important it might be when they are hunting.

Below, we will be taking a closer look at rifle scope lens diameter to get a better understanding of what it is, why it can be important, and what diameter you might need. We will also be discussing two quality rifle scopes that might work well for your next scope.

Where is the Objective Lens Located on a Scope?

The objective lens is the lens that is furthest from your eye when you are looking through a scope. The objective lens is housed in the objective bell, which is simply a term used for this part of the housing.

The ocular lens is the lens through which you are looking. The scope features an erector tube, which is the body of the scope and which houses the reticle. Scopes will also have a turret system that includes adjustment knobs for elevation and windage, while some also have a side knob for parallax adjustment.

What Do the Numbers Mean When Looking at Scopes?

When you see scopes on the market, you will notice that they typically have a set of numbers associated with them. For example, you might be comparing two scopes. One is 3-9×40 and another might be 10-60×52. The first set of numbers refers to the magnification of the scope.

A 3x to 9x scope will have a variable magnification from 3x to 9x the power of the naked eye. It’s the second number that that provides you with the objective lens diameter. This would be 40 or 52 in the examples above. It refers to the size in millimeters. The objective lens is larger than the rest of the scope in most cases.

They are larger to allow more outside light to pass into the scope, which can produce a brighter image for you in the sight picture. One of the myths that you want to have dispelled now is that having a larger objective lens does not mean that you will have a wider field of view.


Factors to Consider When Choosing an Objective Lens

Two Rifle Scopes to Consider

We’ve decided to include some information on two popular rifle scopes that could be a good choice for your next scope. Both of the scopes in question feature a 50 mm objective lens, and both are durable, making them a good choice for hunting at longer ranges. If you aren’t hunting at those ranges, keep the tips above in mind when you are searching for the right scope for your needs.

Athlon Optics Argos BTR

Athlon Optics Argos BTR

The Argos from Athlon Optics is a 6-24×50 first focal plane rifle scope that features a 30 mm tube and an illuminated APMR MIL reticle. The reticle will remain valid no matter the power settings by growing or shrinking when you zoom in or out.

The lenses are multi-coated, which provide excellent light transmission and brightness in your sight picture. Combined with the 50 mm objective lens, this should provide you with plenty of light even when the lighting conditions are less than stellar.

You will also be pleased to know that it is made from 6061T6 aircraft-grade aluminum that provides excellent strength. It also provides great thermal stability and waterproofing, while also being shockproof.

Mueller AO Eraticator Rifle Scope

Mueller AO Eraticator Rifle Scope

The rifle scope is 8.5-25x magnification with a 50 mm objective lens. It is available in black, as well as silver. Those who will be hunting with the scope will likely want to choose the black option, but it’s ultimately up to your preferences.

The scope has a micro-fine crosshair with a black dot for daylight conditions, along with an illuminated micro-dot for getting on target fast, even at a distance in low-light conditions. There are 11 illumination intensity settings. The scope was designed for those who were taking long-range shots on smaller targets, but it can easily be used to hunt bigger game at long-range.

The turret system has 1/8 windage and elevation click stops, and you will be able to make adjustments with your fingers. While this scope can work well for long-distance, you will find that it can work well for shorter, distances, too. It can focus down to a minimum of 20 yards, making it a very versatile option with a large diameter objective lens.

Conclusion: What Rifle Scope Objective Lens Diameter is Right for You?

When you are choosing between the various rifle scopes on the market, consider the information above when you are looking at the objective lens. You will find that 40 mm and 50 mm can do well for many hunters and shooters, but there are other diameters available, as well. Consider your shooting style and preferences, and always make sure that you are choosing the best quality optics possible.

The 50 mm scopes that we’ve mentioned above can work well for many who want to have a quality scope that can provide them with the brightness and clarity they need without getting in the way or being too heavy. Take the time to find a scope that’s right for you.