Repair

You may have noticed that placing your eye at different positions behind the scope's eyepiece causes the reticle crosshairs to appear to move around to different points on your target. This is called "parallax error" (target and reticle are not in the same focal plane), and it becomes more noticeable (and more of a problem) at shorter distances and/or when the scope is set to higher powers. Your riflescope may provide an adjustment for parallax compensation, which works by moving an optical element until the target (based on its distance) appears in the same plane of focus as the reticle. Instead of the typical parallax compensation design which adjusts the objective lens at the front of the scope ("adjustable objective" or "AO"), your scope uses a movable lens back near the reticle, so the adjustment can be more easily made with a "side focus" knob placed next to the windage and elevation adjustments. Just line up the estimated distance to your target with the index line on the body of the scope, and you will eliminate the aiming errors caused by parallax.