Parallax Effect Explained
Parallax is something that has confused many a shooter and has probably been the cause of more accuracy problems that many would care to admit.
By definition parallax is the apparent movement of the reticle against a target caused by the reticle and the image of the target not being on the same focal plane.
The image above is a rough depiction of what parallax is. As the eye moves away from the axis of the scope, the reticle appears to move around the target, which can affect the shooter’s accuracy if there is not a consistent cheek weld from shot to shot.
Getting parallax-free means that no matter where the eye goes in relation to the scope’s axis the reticle stays fixed on the same spot on the target, greatly aiding in accuracy.
Removing parallax from the scope:
1. Look through the scope at a target and move the head up and down slightly without moving the rifle.
2. If the reticle seems to bounce downwards then you have to turn the knob for a closer distance setting. If the reticle appears to bounce up then the knob must be turned to a setting for a farther distance.
Adjust for closer distance.
Adjust for farther distance.
3. Continue to move the head up and down slightly until there is no movement of the reticle against the target. The scope is now parallax free at that distance.
Note: Sometimes, however this is not always the case, the image clarity will also be best when there is no parallax.
