The distance along the optical axis of a lens from the principle plane of that lens to either the image plane (for an image conjugate) or the object plane (for an object conjugate). Lenses designed to focus at infinity have an infinite conjugate distance for the object and a finite conjugate distance for the image.
See also Principal Plane , Finite/Finite Conjugate , Infinite/Finite Conjugate , Infinite/Infinite Conjugate
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