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A Paul-Baker telescope is a type of three-mirror-anastigmat reflector telescope which was described in 1969 by James Gilbert Baker, consisting of a concave parabolic primary, a convex spherical secondary, and a concave spherical tertiary mirror. This was a modification of a Paul telescope, a three-mirror anastigmat design described in 1933 by Maurice Paul, which combined the concepts of a Schmidt telescope and a Mersenne telescope (Mersenne beam compressor), producing essentially a purely-reflector-based version of a Schmidt telescope. Like the Schmidt telescope, the Paul telescope had a curved focal plane, and Baker's modification made the focal plane flat.
The Rubin Observatory telescope has been described as a "modified Paul-Baker" telescope. One modification is that a single mirror carries out the function of the tertiary as well as the primary (thus serves as two mirrors), such a two-mirror design termed an Eisenberg-Pearson Telescope.