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total image runout

Image displacement by a decentered lens, rotated on a chuck whose axis of rotation passes through the geometrical center of the rim of the lens, when the light source is at an infinite distance. It is a measure of the decentering. Conversely, if the light source is at the focal point of the lens, the direction of the emergent parallel bundle alters through an angle that measures the decentering in angular terms.
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