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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.
Parallax in rifle scopes manifests as the reticle or crosshairs, appearing to be on different points on the target due to slight changes in the position of the eye, relative to the scope's eyepiece.arallax in rifle scopes manifests as the reticle or crosshairs, appearing to be on different points on the target due to slight changes in the position of the eye, relative to the scope's eyepiece.