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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.
Parallax adjusts the target to the reticle (crosshair). The target image and the reticle must be on the same focal plane within the scope or there is room for apparent movement of the reticle on the target when the shooter'e eye moves (or is positioned differently at the scope).