AIM Sports Green Laser Scopes - Manual (Page 20)

ABOUT VARIABLE POWER
AIM variable power scopes allow you to select from a range of
magnifications to suit your particular rifle, cartridge, and shooting needs.
Warning: Do not loosen the screw in the power selector ring. Doing
so will release the internal gas that keeps the scope fog free. Loosening
the screw will also disconnect a pin that controls the internal operations,
causing other problems that would require factory repairs. Do not
lubricate the power selector ring; doing so is unnecessary.
All variable power scopes have a power selector ring in front of the
eyepiece assembly. Turn the ring to align the number indicating the desired
magnification with the indicator on the body scope.
Scopes that are equipped with reticles such as the Rangefinder reticle or
a BDC (Bullet Drop Compensator) turret allow the shooter to manually set
a reference point of impact based on the current trajectory of the bullet.
However, it is important to note that scopes that have the rapid ranging
reticles or a BDC may require fine tuning to achieve maximum precision.
Factors that the shooter must take into consideration when using these
features are bullet weight, powder load, ammunition manufacturer, and
general shooting conditions.
UNDERSTANDING PARALLAX
Parallax is the apparent movement of the target relative to the reticle when
you move your eye away from the center point of the eyepiece. It occurs
when the image of the target does not fall on the same optical plane as the
reticle. This can cause a small shift in the point of aim.
Maximum parallax occurs when your eye is at the very edge of the exit
pupil. (Even in this unlikely event, our 4x hunting scope focused for 150
yards has a maximum error of only 8/10ths of an inch at 500 yards.)
At short distance, the parallax effect does not affect accuracy. (Using the
same 4x scope at 100 yards, the maximum error is less than 2/10ths of an
inch.) It is also good to remember that, as long as you are sighting straight
through the middle of the scope, or close to it, parallax will have virtually no
effect on accuracy in a hunting situation.
ABOUT FIXED PARALLAX DISTANCE SCOPES
Any fixed focus optical system can be adjusted to be parallax free at only
one distance. Most AIM scopes are adjusted at the factory to be parallax
free at 150 yards. AIM 2.5x scopes are set to be parallax free at 100 yards.
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