My rifle experience has ben limited to a 10/22 with iron sights, and I have never sighted in a rifle scope before. The scope I have has a factory set parallax of just 75 yards (it's a shotgun scope) which is not adjustable. In the absence of an adjustment knob, is there any way compensate for parallax at longer ranges? (aside from buying a new scope...)
parallax
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General Geoff
Member
Sway your head an inch or two from side to side as you look at your target. This will give you a perspective as to how disruptive any parallax may be at that range, and you can usually hedge out the peripheral error by finding the median between the crosshair positions when viewed from either side of the scope lense.
Don't think I'd worry too much about parallax a 22 ranges. Most more powerful scopes on the market don't have parallax adjustments. Are you planning a long range rifle? If you are then give PA some thought. Your scope is set up for shotgun ranges, which would be around 75 yards.
Fumbler
Member
Those are good replies.
The only way to change the parallax-free distance is to move the objective lens. That takes special tools with a fixed objective scope.
Parallax is not a problem if you shoot with your eye/head close to the exact same spot every time.
Try to always keep a consistent "black ring" when looking through the scope.
The only way to change the parallax-free distance is to move the objective lens. That takes special tools with a fixed objective scope.
Parallax is not a problem if you shoot with your eye/head close to the exact same spot every time.
Try to always keep a consistent "black ring" when looking through the scope.
clarification
I should have been more clear in my original post. My only previous rifle experience has been with a non-scoped .22, but I just stuck this scope on a mini-14 (.223) which I have yet to shoot. Still not exactly a long-range rifle, but certainly I'll br trying for further than 75 yards.
I should have been more clear in my original post. My only previous rifle experience has been with a non-scoped .22, but I just stuck this scope on a mini-14 (.223) which I have yet to shoot. Still not exactly a long-range rifle, but certainly I'll br trying for further than 75 yards.
boilingleadbath
Member
My understanding - which is self-forged, and thus shouldn't be trusted - is that the parallax error is due to looking at the target through different portions of the objective lens.
As such, I'd expect the amount of parallax error at a certain range to be determined by the objective aperture (size of front lens) and the parallax-free distance.
While it's true that the shotgun scope is parallax-free at ~75 yards, it'll also have a fairly small objective; and I suspect that a small objective limits the amount of parallax error you get. (because the outer edges of the objective are closer together)
If I am correct, a parallax-error-free range of 75yards means that you'll have 1 objective diameter of parallax at 0 and at 150 yards; 2 diameters at 225 yards, and so on.
Of course, I have no training in optics, and don't really know what I'm talking about... so you can always just rest the rifle on a bench, and move your eye around to see how bad the parallax is at any particular range.
Or we can wait to see if someone knows.
As such, I'd expect the amount of parallax error at a certain range to be determined by the objective aperture (size of front lens) and the parallax-free distance.
While it's true that the shotgun scope is parallax-free at ~75 yards, it'll also have a fairly small objective; and I suspect that a small objective limits the amount of parallax error you get. (because the outer edges of the objective are closer together)
If I am correct, a parallax-error-free range of 75yards means that you'll have 1 objective diameter of parallax at 0 and at 150 yards; 2 diameters at 225 yards, and so on.
Of course, I have no training in optics, and don't really know what I'm talking about... so you can always just rest the rifle on a bench, and move your eye around to see how bad the parallax is at any particular range.
Or we can wait to see if someone knows.
Oohrah
Member
If you have the same face meld on the stock, it won't
make a difference. Scopes are much improved to where
even the less expensive are not too bad! The only sure
cure is using a scope that has an an adjustable front or
AO that by turning the front lens to the distance the target
is at, it removes any paralex. To determine if this exists,
if you move your face on the stock and the cross hairs move,
your scope is out of focus for that range. By adjusting
the front lens by turning the front lens upward, it eliminates
the paralex when you are at the correct distance. A clear
picture, reticle, and non moving cross hairs.
make a difference. Scopes are much improved to where
even the less expensive are not too bad! The only sure
cure is using a scope that has an an adjustable front or
AO that by turning the front lens to the distance the target
is at, it removes any paralex. To determine if this exists,
if you move your face on the stock and the cross hairs move,
your scope is out of focus for that range. By adjusting
the front lens by turning the front lens upward, it eliminates
the paralex when you are at the correct distance. A clear
picture, reticle, and non moving cross hairs.
rcmodel
Member in memoriam
Parallax isn't really much of a problem until you get above 10x - 12x or so.
It really gets worse and more critical at higher magnification.
That is why you see many more AO & side-focus scopes when you get past the 3x9 variables, and hardly any AO's on anything below that.
You also see AO a lot on lower power air gun scopes, because they are often shot at 10 yards on indoor match shooting, out to 50 - 60 yards on sm. game & field shooting. With that much precision needed for 10 yard target competition, and wide range of close to mid range shooting, AO is needed on them.
As already mentioned, keep your head / eye in the same place with a low power .22 or shotgun scope and it shouldn't be a problem unless your scope is really out of whack.
rcmodel
It really gets worse and more critical at higher magnification.
That is why you see many more AO & side-focus scopes when you get past the 3x9 variables, and hardly any AO's on anything below that.
You also see AO a lot on lower power air gun scopes, because they are often shot at 10 yards on indoor match shooting, out to 50 - 60 yards on sm. game & field shooting. With that much precision needed for 10 yard target competition, and wide range of close to mid range shooting, AO is needed on them.
As already mentioned, keep your head / eye in the same place with a low power .22 or shotgun scope and it shouldn't be a problem unless your scope is really out of whack.
rcmodel
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