AIM Sports Fiber Optic Tri-Illuminated Scopes - Manual (Page 18)

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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.
CENTERING WINDAGE / ELEVATION ADJUSTMENTS
Making windage and elevation adjustments moves the entire erector
system horizontally and vertically inside the scope. If the erector system is
off to one side – as a result of having been mounted on a non-adjustable
mount – the adjustments won’t provide equal travel in all directions. To
regain full balanced travel, you must re-center the adjustment as follows:
1. Turn the windage adjustment to the point that it stops moving.
2. Counting the clicks or hash marks, turn it all the way in the other
direction.
3. Turn the dial back half the amount of clicks or hash marks counted.
4. Repeat this process for the elevation adjustment
MICROMETER-STYLE ADJUSTMENTS
AIM Target, Hunting, and Tactical scopes have micrometer-style windage
and elevation adjustments. A click for each adjustment division can be both
heard and felt so adjustments to the scope can be made without looking
at the dials.