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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))

Sj

= 0'

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