Fig. 3.27. The Schmidt telescope (1931)

will correct the third order spherical aberration Sj. Because of its symmetry at the pupil (HdE = 0), it is free from third order field coma and astigmatism Sjj and Sjjj (Eq. (3.215)). Thus, monochromatically, it achieves the same correction (proven formally, as for the Bouwers telescope, in Eq. (3.227))


= 0'

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