This can cause the scope to be off target depending on how your eye aligns with the optic and lead to poorly placed or completely missed shots. What you need is for both reticle and target to be on the same focal plane. Most centerfire rifle scopes without parallax adjustment are set at yards, which is fine for shots at distances under Rimfire or pistol scopes are set at even less. But most scopes made for more long-range shooting do have a parallax adjustment, either as an adjustable ring on the objective lens or more commonly as an adjustable turret on the side of the scope.
To adjust a scope where parallax is an issue, adjust the parallax adjustment all the way to infinity. If you're a reflex or red dot sight kinda guy, then you can safely say that you've never experienced parallax at all.
They're what you would call "parallax free" devices at all distances. This is because reflex sights have little to no magnification abilities we'll come back to magnification and parallax later. Now that we've got the foundation laid to understanding parallax, I'm going to take you through the meat of this article. Here, we'll get into how to use your parallax adjustment feature, how to get rid of parallax even if you opt for a fixed objective rifle scope, and why you would want to adjust for parallax.
Focusing a rifle scope is a one time adjustment that shouldn't be done again unless someone else used your scope. It's like getting back in the drivers seat after someone borrowed your car - you need to adjust the mirrors, the seat position, and perhaps even the steering wheel and pedal heights.
Once you've got the most comfortable and most practical position behind the wheel, you shouldn't have to adjust any of those components again. The goal of focusing is to get the reticle focused for your set of eyes. There's no way you can adjust for parallax and get dead on if the foundation hasn't been cemented in. These features include adjustable objectives and side focus and we are going to give you some tips to using both of those in the next section.
We will also offer up some tips to eliminating parallax with a fixed objective. Let's get into the 27 tips! TIP 1. The top surface of the AO will be marked with distances as references for you to aid in correcting parallax.
TIP 2. These distances will be marked in yards or meters. If your scope reads in yards but you need meters, don't panic and remember the distance markings are more for references.
You'll still need to play around with the AO until it's reached the right focal distance - you'll know when it's right because the image will be crisp and sharp without any cross hair travel. TIP 3. If you're not sure what distance your target is in, this would be a pretty good time to whip out your laser rangefinder. Lucky for you, we have loads of info on them to muse through before you choose to buy a hunting rangefinder.
Once you have the range, move the AO to the referenced distance that's appropriate and tweak for the best image from there. TIP 4. As you are turning the AO, move your head and eyes up and down or sideways to ensure you're reducing as much of the floating effect as you possibly can. TIP 5. Looking through the rifle scope and reaching for the AO might not be as comfortable as you hope it would be. Sometimes the not-easily-seen reference markings on the AO, length, and sheer size of a scope may force you to leave your sight picture just to make the adjustments.
Make sure you take size, length, and markings into consideration before you buy a rifle scope with AO. TIP 6. Ensure your stance and head, cheek, and eye placement are consistent every time more on this later!
Try to look through the center of the scope from the same position with each shot. TIP 7. This is an unconventional tip since it might void your warranty if you have one and intend to use it. But, some people choose to do it and it provides a more accurate and faster way to get parallax free for that known distance. Remember how I said reference markings are just that - references?
That's because the markings might not always be completely accurate with your image quality while getting rid of parallax. In this case, you can disregard the reference markings and make your own. Set up a time to hit the range and take full advantage to calibrate your AO settings for your eyesight. TIP 8. It shouldn't be a big deal if you're not going to calibrate your AO. The deeper depth of focus an AO provides can give you wiggle room to use a middle-range parallax setting that will be suitable for most of your shots.
TIP 9. If you have an illuminated reticle, the side focus turret can sometimes double as the illumination control. TIP If you have a side focus that's measured in meters and you need yards, there's no need to freak out. Continue making the adjustments as necessary since you're calibrating the scope for the best image without parallax anyway. To calibrate the side focus for a particular distance, rotate the dial all the way up past the infinity setting until it stops.
If your parallax is not adjusted for the range at which you are shooting, then you will hit off center any time your eye is off center all other variables notwithstanding.
A non-adjustable parallax scope will be set at a distance that is a good compromise to get you fairly close at ranges within the intended purpose of the scope. A scope for hunting may be set for yards, while a long-range scope would be set to be fairly parallax-free from, say, or yards to infinity. IMO, you want adjustable parallax for a sniper rifle. Jul 17, 0 56 SW, MI. Depends how small of target your shooting at.
Deer, no parallax adjustment need, golfball at yrds, better have all the parallax adjusted out! The Bushnell 10x40 is an awesome no frills scope, seems to be focused at any range, but mine had parallax issues at yrds that I swear could vary by at least 2" If you can line up behind the rifle perfectly every time, you don't need the adjustment, I prefer SF or AO, myself.
HD Full Member Supporter. Nov 19, 18 Western KY. Now granted, I have only shot it at yards to test different ammo and get my yard zero squared away. I just had a really hard time staying perfectly straight and the image looked like ass if I moved even the slightest bit. I looked thru some guys NXS with sidefocus and a mark 4 with sidefocus and liked both of those much better.
Mar 16, 3, 96 Surprise, AZ. Same problem with my old tired eye muscles can't keep focus for an exteded period and things stsrt to get blurry. You are not alne with this problem.
Oct 20, 0 Utah. Generally speaking the higher the magnification the more parallax adjustments are needed. This is why scopes below 9X seldom have parallax adjustments. Is this good or bad? It is all about application of the optic. Thus the requirement for parallax adjustment. I shoot a M1a and HK91 with the Super Sniper at steel targets out to yards and I don't miss the parallax adjustment.
Where these lenses are inside the scope is important. The ocular lens is the lens through which you look to sight your scope. The objective lens is the glass closest to your target and is responsible for gathering all the light you see through your scope.
The last two lenses, the focus lens and the magnifying lens, are housed in the erector tube. The erector tube is the center of the scope and is often smaller in diameter than both the objective lens and ocular lens housings. First focal plane scopes put the reticle in front of the magnifying lens. A second focal plane scope places the reticle behind the magnifying lens. This helps explain why the reticle changes size in a first focal plane scope and remains static in a second focal plane scope.
Understanding the internal arrangement of the lenses and the reticle helps explain the parallax issue. With a basic understanding of how the lenses and the reticle are arranged inside your rifle scope, we can begin to grasp how parallax fits into this picture. We know that the parallax problem is caused by the image of the target not being in focus, or on the same focal plane, as the reticle.
As you might guess, the method of adjusting parallax errors depends on adjusting the internal focus of the target image in relation to the reticle. The key issue is which lens inside the riflescope is moved to change the focal plane of the target image.
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