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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.
See also. 1  Disparity. 2  Lutz Kelker bias. 3  Parallax mapping, in computer graphics. 4  Parallax scrolling, in computer graphics. 5  Refraction, a visually similar principle caused by water, etc. 6  Spectroscopic parallax. 7  Triangulation, wherein a point is calculated given its angles from other known points.