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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.
Best Answer: 4x means it magnifies things 4 times 4x is a common choice, it is a good comprimise between wide field of view and good magnification. 6x is also quite common. another thing to look for is 2-7x or 3-9x or 4-12x etc these are variable scopes, you can have a 2-7x at 2x or 3x or 4x or 5x or 6x or 7x.2 means the diameter of the scope tube. Wider tubes gather more light, but this is mostly important for bigger magnifications. 4x32 is a common setup for a 22 rifle scope 3-9x40 is a common deer hunting scope.