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A rifle scope parallax is a known optical illusion where the target looks out of focus and the focal plance of the target is offset from rifle scope reticle.It is the apparent movement of the reticle when the eyes move off center of the sight picture. rifle scope parallax is a known optical illusion where the target looks out of focus and the focal plance of the target is offset from rifle scope reticle.
The most misunderstood and often incorrectly set rifle scope adjustment of all .... is the parallax setting. This is NOT a focus adjustment or a range finder. The parallax adjustment eliminates the optical error when shooting at different distances. This is accomplished by positioning the lenses to correct the parallax at each specific distance, making sure the image focuses on the same plane as the crosshairs .... not in front or behind them. The way to make this adjustment is seldom to just dial the correct distance printed on the scope.