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Parallax is defined as an object appearing as if it is positioned differently when it is looked at from different angles or different positions.
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.When this happens, it means that the scope is either the target image is no occuring on the same focal plane as the reticle or the scope in out of focus.t is the apparent movement of the reticle when the eyes move off center of the sight picture. When this happens, it means that the scope is either the target image is no occuring on the same focal plane as the reticle or the scope in out of focus.