Parallax adjustment on scopes

[bronsonb1]

I have been poking around the web for an explanation on how the parralax adjustments on scopes actually works. Turns out I was very confused about it. I thought it just changed the scopes focus and a certain range, some have told me that it helps you find ranges somehow. But its actually very important for accuracy. From what I understand it keeps the reticle from moving and a certain range, am I right? I was hoping someone could explain this to me because I have been told to many different things about parralax adjustments and I just need to know what they are actually for. Maybe if we get a good explanation we could put together a sticky about it for new guys like myself.
Thanks!

[ronas]

First you set the reticle to be in focus using diopter adj.

Then you have the parralex adj. Simply stated it is the side focus knob, usually but not always on the left hand side of the scope, opposite the windage knob.

The side focus is just that; you use it to focus image of target. Not sure of closest range a side focus will function. Mine will work at 100 yard, the range I established zero. It will focus all the way to 800 and beyond. Not sure how far beyond since my range on goes to 800 yards.

[BSlacker]

Parallax is simply focus at a certain distance. That is why some say they can use the parallax adjustment to judge distance. When viewed thru the scope if the desired target is in focus you should be able to read the distance off the adjustment ring. The calibration of a cheap ring is not precise enough to use for most uses. Its more of a notation.
On a non parallax adjustable scope the focus is set at a certain distance and is fixed there. This distance is based on the intended use like rimfire or centerfire hunting. When viewing targets some distance from this set focal point the target will be out of focus as seen by the eye. An out of focus image has no sharp edge to the eye and the eye will respond by seeming to move the reticle (the thing that is in focus to the eye, hopefully) in relation to the target plane being viewed when you move the eye around by moving your head. This parallaxed view is not important to the hunter that has a good cheek weld and holds the head steady. Who moves the head around while aiming at the target? Eyery one I know strives to get rifle and head steady. The object will be a little blurred but the aim will be true. Parallax is an illusion between the eye and brain as the rifle and target are not moving when you see this affect of the eye seeing something out of focus and something (reticle) in focus when the eye is moving in relation to the scope/target image.

[bronsonb1]

First you set the reticle to be in focus using diopter adj.

Then you have the parralex adj. Simply stated it is the side focus knob, usually but not always on the left hand side of the scope, opposite the windage knob.

The side focus is just that; you use it to focus image of target. Not sure of closest range a side focus will function. Mine will work at 100 yard, the range I established zero. It will focus all the way to 800 and beyond. Not sure how far beyond since my range on goes to 800 yards.

So there are two adjustments involved? Is the diopter the one that is numbered often times from 50 to 600 or 800? Or is that the parralax? And what is the nob on the left side of scopes that is numbered 1-9 or more? Is that the parralax?
Thanks!

[Black Majik]

The diopter setting is usually on the eye piece/ocular. Most scopes allow you to turn the eye piece to focus the reticle. Look at a neutral target (white wall, blue sky) then look through the scope. Is the reticle crisp? If not readjust your eye piece and look through again. Do not look through the scope while adjusting as your eyes will focus on the reticle.

The numbered adjustments are usually your parallax adjustments, either on the side turrett or on the objective bell.

[bronsonb1]

Parallax is simply focus at a certain distance. That is why some say they can use the parallax adjustment to judge distance. When viewed thru the scope if the desired target is in focus you should be able to read the distance off the adjustment ring. The calibration of a cheap ring is not precise enough to use for most uses. Its more of a notation.
On a non parallax adjustable scope the focus is set at a certain distance and is fixed there. This distance is based on the intended use like rimfire or centerfire hunting. When viewing targets some distance from this set focal point the target will be out of focus as seen by the eye. An out of focus image has no sharp edge to the eye and the eye will respond by seeming to move the reticle (the thing that is in focus to the eye, hopefully) in relation to the target plane being viewed when you move the eye around by moving your head. This parallaxed view is not important to the hunter that has a good cheek weld and holds the head steady. Who moves the head around while aiming at the target? Eyery one I know strives to get rifle and head steady. The object will be a little blurred but the aim will be true. Parallax is an illusion between the eye and brain as the rifle and target are not moving when you see this affect of the eye seeing something out of focus and something (reticle) in focus when the eye is moving in relation to the scope/target image.

So If I understand what you are saying, parralax is not very important to a well trained shooter? That if I keep my head steady I will not experience this affect?

The diopter setting is usually on the eye piece/ocular. Most scopes allow you to turn the eye piece to focus the reticle. Look at a neutral target (white wall, blue sky) then look through the scope. Is the reticle crisp? If not readjust your eye piece and look through again. Do not look through the scope while adjusting as your eyes will focus on the reticle.

The numbered adjustments are usually your parallax adjustments, either on the side turrett or on the objective bell.

Thanks! I will be trying this next time a visit the range!

[freonr22]

good reading http://www.calguns.net/calgunforum/s...ighlight=scope

[Black Majik]

Thanks! I will be trying this next time a visit the range!

Actually this is best done at home. You want your "target" as plain as possible without any details. Wall, cloudless sky are most ideal. Good luck!

[bronsonb1]

Actually this is best done at home. You want your "target" as plain as possible without any details. Wall, cloudless sky are most ideal. Good luck!

Really? Ok Ill try it now then!

[ronas]

So If I understand what you are saying, parralax is not very important to a well trained shooter?

I would say parrallax is critical if the scope does not have parrallax at a set distance when it's manuf.

Without side focus/parrallax I would not be able to focus clearly on target. I think adjustable parrallax is expensive to include as part of any scope.

[thevic]

If you cant see it, you cant shoot it.