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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.
Once the scope is set to high magnification, the easiest way to range a target is to take the height (or width) of the target in yards or meters multiplied by 1000, then divide by the height (or width) of the target in MILs to determine the range to target. Of course the measurements can be taken in inches.