AIM Sports Scopes - Manual (Page 17)

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ADJUSTING WINDAGE AND ELEVATION
The adjustment cover is integral to the adjustment mechanism.
To make a correction, simply rotate the adjustment cover
counterclockwise until it “pops up,” fully revealing the adjustment
indication markings, and make the appropriate correction. To
secure the adjustment cover, push down while tightening the
cover.
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.