Shooting Accuracy: What is a Parallax Adjustment on a Scope?
If you shop for a riflescope in a real store or online, you’ll find parallax adjustment scope one of the features that is often highlighted.
If you have ever done any amount of shooting – or asked someone who has – you’ll know that parallax correction is important. If all this sounds new to you, this guide can help. I’ll explain what a parallax is, how it works and what the benefits are.
Objective and Benefits of Parallax Correction
Have you noticed how the cross hair on some scopes just won’t stay put? Every time you make the slightest move the cross hair moves also. Well that’s what parallax correction will do, keep the cross hair steady.
In simple terms this means your scope will remain locked on your target so you’ll be able to shoot with accuracy.
Another benefit of parallax is the image will end up at the same focal plane as the cross hair / reticle. The more powerful your scope is, the more important parallax correction is.
Parallax and Lens
- Objective Lens: the position of the objective lens assembly is what is changed when you adjust the parallax via an AO (adjustable objective). Turn the AO to the distance indicated on the outer surface, it moves the objective lens assembly until the image and reticle are on the same plane.
- Focus Lens: the focus lens’ assembly placement is adjusted if you use a side focus to modify the parallax. When you rotate the side focus knob towards infinity, the assembly moves towards the objective lens. Turning the knob to a lower distance moves it to the ocular lens.
How to Adjust Parallax on a Rifle Scope
Here is a step by step guide.
Focus the Eyepiece
Your objective is to get the cross hair focused for your eyes. You have to do this before tinkering with the parallax.
How to Adjust the Parallax with an Adjustable Objective
How to Adjust Parallax with Side Focus
Side Focus vs. Adjustable Objective
Side focus is easy to use and they’ve got very visible markings. Side focus is also helpful for wind reading in certain conditions.
An adjustable objective makes it easy to correct any parallax, and there is no additional turret. You can even use this as a range finder if you don’t have one. Depth focus is also good and provides greater adjustment than side focus.
While side focus offers some benefits, AO is superior and is the better choice.
A parallax adjustment scope is crucial in improving accuracy. Parallax also takes out a lot of the frustration that comes from using a riflescope.
Most new users of riflescopes wonder why their shots are way off. More often than not it is because the reticle and image are not aligned.
By adjusting your scope you’ll be able to fix the reticle issues, and it makes shooting more accurate. For accuracy and precision with a high powered riflescope, parallax correction is a must.