Introduction
Investing in a high-quality rifle scope is a significant commitment. These optical instruments, meticulously engineered to magnify and clarify your target, significantly enhance your shooting accuracy. However, a scope is only as good as its protection. That’s where scope caps come in. They are often overlooked, yet incredibly important accessories that guard your valuable optics from the elements and potential damage. Choosing the right scope caps is crucial, but can sometimes seem like a daunting task.
This article will serve as your comprehensive guide to understanding and selecting the ideal scope caps. We’ll explore why scope caps are so vital, decipher the cryptic measurements of your scope, and most importantly, provide a detailed and easy-to-use scope cap size chart to help you find the perfect fit. With the correct knowledge, you can ensure that your scope remains in pristine condition, providing you with years of reliable performance.
What Are Scope Caps and Why Do You Need Them?
Scope caps are protective covers designed specifically for the lenses of your rifle scope. They are generally made from durable materials such as plastic, rubber, or metal, and designed to fit snugly over the objective lens (the front lens) and the eyepiece lens (the lens you look through).
The benefits of using scope caps are numerous and can significantly extend the lifespan and performance of your scope. First and foremost, scope caps offer protection against the elements. They shield your scope lenses from dust, dirt, moisture, and debris. In a hunting or outdoor environment, these elements can easily accumulate on your lenses, obstructing your view and reducing clarity. Rain, snow, and even morning dew can quickly degrade the quality of your sight picture.
Furthermore, scope caps protect your scope from scratches. Even a small scratch on your lens can dramatically affect your ability to see your target clearly. Scope caps act as a barrier, preventing accidental contact with abrasive materials like rocks, branches, or other gear.
Scope caps also help to maintain the clarity of your scope’s lenses. By preventing the build-up of dirt and debris, they ensure that light passes through your scope unhindered, providing you with a sharp and clear image. This is particularly important in low-light conditions when every bit of light is crucial.
Another advantage of using scope caps is they provide a degree of protection from direct sunlight. Sunlight can sometimes cause glare, which can make it difficult to see your target. Caps can also reduce internal heat build up.
Finally, using scope caps is a simple but effective way to extend the lifespan of your investment. By minimizing the risk of damage and contamination, you can keep your scope in optimal condition for years to come.
There are several different types of scope caps available on the market. They all serve the same fundamental purpose, but they vary in design and functionality. Some of the most common types include:
- Flip-up scope caps: These are arguably the most popular choice. They are hinged and flip open quickly, allowing for rapid deployment. They are generally easy to use and offer excellent protection.
- Elastic scope caps: These are simple covers made of stretchy material that fit over the lenses. They are generally inexpensive and easy to apply, but may not offer the same level of protection as other types.
- Screw-on scope caps: These caps screw directly onto the scope’s threaded lens housing. They are typically very secure and offer a tight seal, but can take a little longer to remove and replace.
- Objective lens caps: These caps specifically cover the objective lens (front lens).
- Eyepiece lens caps: These caps are made to cover the eyepiece (the lens you look through).
Understanding Scope Measurements
To find the correct size of scope cap, you need to understand a few key measurements associated with your scope. These measurements are often stated on the scope itself, in the product specifications, or within the user manual. If you can’t find the specifications you may use calipers for greater accuracy.
The most important measurement is the **Objective Lens Diameter**. This refers to the diameter of the front (objective) lens of your scope, usually measured in millimeters (mm) or inches (in). This is the measurement you’ll primarily use to determine the size of the objective lens cap. It is critical that you use this measurement accurately.
The other relevant measurement is the **Eyepiece Lens Diameter**. This is the diameter of the lens you look through. This measurement is useful for determining the size of the eyepiece lens cap.
You can usually find the objective lens diameter and eyepiece lens diameter printed directly on the scope tube itself. Look for markings like “50mm,” “44mm,” or something similar. If the measurements aren’t there, consult the scope’s product specifications. These specifications can be found in the scope’s manual or on the manufacturer’s website. They often include detailed information about the scope’s dimensions and features.
If you are unsure, a tool like a digital caliper will provide a definitive measurement. It can be used to take a very precise measurement of the lenses. This is particularly helpful if the lens markings are not clear or not present.
The Scope Cap Size Chart
Finding the right scope cap shouldn’t be a frustrating process. The following chart provides a useful guide to finding compatible scope caps. Keep in mind that compatibility can depend on the scope model and sometimes even the brand. Always double-check the compatibility with the scope you are purchasing.
*Please Note: While these charts offer a starting point, it’s always best to check the manufacturer’s specifications to ensure a perfect fit. Some scopes, particularly those with unique designs, may require specific scope caps.*
| Objective Lens Diameter (mm / in) | Suggested Scope Cap Size or Model | Notes/Additional Information |
|---|---|---|
| 20-24mm (0.79 – 0.94 in) | Usually a size Small | Often compatible with smaller rimfire scopes. |
| 32mm (1.26 in) | Usually a size Medium | Common for scopes found on AR-15 or other tactical rifles. |
| 40mm (1.57 in) | Usually a size Large | Commonly used on hunting scopes. |
| 42mm (1.65 in) | Specific models may be needed | Many popular hunting scopes. |
| 44mm (1.73 in) | Specific models may be needed | Look for caps specifically designed for this objective diameter. |
| 50mm (1.97 in) | Specific models may be needed | Very popular objective lens diameter. |
| 56mm (2.20 in) | Specific models may be needed | Larger objective lens diameters, frequently found on long-range scopes. |
| Eyepiece Specific | Specific models may be needed | Eyepiece dimensions vary by brand and model. |
*How to use the chart:*
- Determine your objective lens diameter: Check your scope for any markings, or use calipers.
- Find the corresponding size: Locate your scope’s objective lens diameter in the chart.
- Consider the Notes/Additional Information: Pay attention to any model-specific information provided. If you see a particular model number, you may need to research the exact compatible scope cap.
Scope Cap Size Considerations
There are a few extra factors that you should be aware of when choosing scope caps.
Adjustable Objective (AO) Scopes: Scopes with adjustable objectives present a slightly different challenge. The adjustable objective allows you to focus on targets at varying distances. Therefore the front of these scopes may have a slightly larger diameter. Sometimes the front of the scope expands or contracts. Always measure the objective lens diameter with the scope in the position you intend to use it (e.g., the most common distance).
Brand Specificity: Different scope cap brands may use their own sizing conventions. Some brands use a system based on scope model. For example, one brand’s “size large” may be different from another brand’s. It’s always recommended that you verify the scope cap size with the brand’s provided sizing guide.
Tube Diameter: While the tube diameter itself doesn’t directly influence scope cap size, it’s an important measurement to know when you are mounting a scope. This dimension relates to the scope rings and how it is mounted to your rifle.
Types of Scope Caps and Their Features
Let’s delve into the different types of scope caps and their respective pros and cons:
Flip-up scope caps: These are arguably the most popular type of scope cap. They offer a convenient and quick way to protect your lenses.
Pros:
- Quick and easy to open.
- Offer excellent lens protection.
- Durable and reliable.
- Available for a wide range of scopes.
Cons:
- Can be slightly more expensive than other types.
- The hinge can occasionally break if subjected to significant stress.
Elastic scope caps: These are a budget-friendly option that offers basic lens protection.
Pros:
- Inexpensive.
- Easy to apply.
- Lightweight and compact.
Cons:
- Offer less protection than other types.
- Not as durable.
- Can come loose easily.
- Not ideal for harsh conditions.
Screw-on scope caps: These caps provide a secure and tight seal.
Pros:
- Excellent protection against the elements.
- Very secure and reliable.
Cons:
- Can take longer to open and close.
- Can be more difficult to find the correct size.
Objective lens caps: These caps are specifically designed to protect the objective lens, which is the front lens of your scope.
Pros:
- Directly protects the most vulnerable lens.
- Many available for various scope types.
Cons:
- You’ll still need to consider protection for the eyepiece lens.
Eyepiece lens caps: These caps protect the eyepiece lens, the lens you look through.
Pros:
- Protects from dust, dirt and scratches.
- Ensures a clear view.
Cons:
- May not include protection for the objective lens.
When choosing the right scope cap, think about where you’ll be using your rifle. Hunters may need a scope cap that can withstand tough conditions. Target shooters might favor caps that are easy and fast to open.
Where to Buy Scope Caps
Scope caps are widely available from a variety of retailers, both online and in physical stores.
Online retailers: Websites like Amazon, OpticsPlanet, MidwayUSA, and Brownells offer a vast selection of scope caps.
Gun stores/Outdoor retail stores: Many local gun shops and outdoor retailers carry a selection of scope caps.
Specialty optics shops: These stores often specialize in scopes and optics, and they can provide expert advice.
When buying scope caps, consider the following:
Reputation: Choose sellers that have good reviews and a solid reputation for customer service.
Return Policy: Make sure the retailer offers a reasonable return policy, in case the scope cap doesn’t fit.
Brand and Model: If you are not sure what size to purchase, use the original brand of your scope to search for a compatible scope cap.
Conclusion
Finding the perfect scope cap is essential for safeguarding your investment and maximizing your shooting performance. This is not just about keeping your scope clean, but also about ensuring the clearest possible view and extending the lifespan of your equipment. By understanding scope measurements, utilizing the helpful scope cap size chart provided, and considering the various types of scope caps available, you can make an informed decision and select the perfect fit for your rifle.
Remember, a well-protected scope will provide you with years of reliable and accurate shooting. Now that you are equipped with the knowledge, browse our selection of scope caps today and ensure the safety of your rifle scope!
