1 history 1.1 paul 1.2 paul-baker 1.3 korsch history many combinations of 3 mirror figures can used cancel third-order aberrations. in general these involve solving relatively complex set of equations. few configurations simple enough, however, designed starting few intuitive concepts. paul the first proposed in 1935 maurice paul. basic idea behind paul s solution spherical mirrors, aperture stop @ centre of curvature, have spherical aberration - no coma or astigmatism (but produce image on curved surface of half radius of spherical mirror, mirror in air). if spherical aberration can corrected, wide field of view can obtained. similar conventional schmidt design, schmidt refractive corrector plate instead of third mirror. paul s idea start mersenne beam compressor, looks cassegrain made 2 (confocal) paraboloids, both input , output beams collimated. compressed input beam directed spherical tertiary mirror, results in traditional spherical aberration. paul s key insight secondary can co...
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