Scopes 101 : Understanding Rifle Scope Parallax: Fixed vs. Side Adjustable

When it comes to choosing a rifle scope, parallax adjustment is a key feature that often gets overlooked. Whether you're a seasoned shooter or just getting started, understanding the difference between fixed parallax scopes and side adjustable parallax scopes can help you make a smarter decision and improve your shooting accuracy.

Let’s break it down:

What is Parallax in a Rifle Scope?

Parallax occurs when the target and the reticle (the crosshairs) are not on the same optical plane. If parallax isn’t properly adjusted, moving your head slightly can make the reticle appear to "float" on the target, which can throw off your shot. A parallax-free scope ensures the reticle stays perfectly aligned with your target, even if your eye position shifts. Almost all scope are NOT parallax-free. So being able to fine tune the parallax is a game changer.

Parallax Error can be the difference between an impact and tag soup.

Fixed Parallax Scopes

Fixed parallax scopes are set to focus on a specific distance—often 50 yards for rimfire scopes or 100 yards for general-purpose scopes. This simplicity makes them lighter, less expensive, and easier to use, especially for beginners or those shooting at consistent distances.
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The downside?
If you're shooting at distances significantly shorter or longer than the fixed parallax setting, your shot accuracy can suffer. For instance:

• At longer ranges, parallax error can cause you to miss shots because the reticle won't align precisely with your target.
• At shorter distances, the target may appear blurry, making it harder to take a clean shot.

Fixed parallax scopes are great for controlled environments or consistent shooting distances, but they limit flexibility.

NOTE: 
Rimfire Scopes: Same Quality, Different Parallax - Rimfire scopes are often misunderstood. While they have a 50-yard fixed parallax, they are every bit as high quality as their centerfire counterparts. Why 50 yards? Rimfire cartridges like the .22 LR are commonly used at closer ranges, making the shorter parallax setting ideal.
That said, rimfire scopes with fixed parallax share the same limitations as any other fixed parallax scope: accuracy can suffer when shooting at distances beyond the fixed focus point. If you're using a rimfire rifle for varied ranges, a scope with side adjustable parallax is worth considering to avoid these challenges.

Vortex Diamondback Rimfire - 2-7x35mm with a 50 Yard Fixed Parallax

Side Adjustable Parallax Scopes

Side adjustable parallax scopes offer much more versatility by allowing you to fine-tune the focus for your target's specific distance. With a simple twist of the side knob, you can eliminate parallax and ensure your reticle stays crisp and accurate, no matter the range.
Why is this better?

1. Improved Accuracy: Whether you're shooting at 25 yards or 500 yards, side adjustable parallax ensures your reticle stays aligned with your target.
2. Sharper Images: Targets stay clear at all ranges, giving you better visibility for precise shots.
3. Flexibility: Side focus allows you to quickly adapt to changing shooting distances, making it ideal for hunting, competitive shooting, or varmint control.

PS - AO Adjustable Parallax scopes are for the birds! (In hunting, Tactical or competition. Just fine for benchtop warriors.) 

Final Thoughts

While fixed parallax scopes can work well for specific applications, their limitations at varied distances can lead to missed shots and frustration. If you're looking for adaptability, precision, and improved accuracy, a side adjustable parallax scope is the clear winner. And don’t overlook rimfire scopes—they’re purpose-built for close-range precision but may still benefit from adjustable parallax features depending on your shooting needs.
At Brink Excursions, we’re here to help you find the perfect scope to match your shooting style. Check out our selection of quality optics, and let’s make sure you never miss your mark!
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Happy shooting,
Brink Excursions Team