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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 is naturally a problem for some kinds of shooting, as these slight changes can put a bullet off course. However, for most shooting purposes, parallax is not an issue, and most scopes do not have parallax compensators for this reason.