Abstract
A generalization of the plate diagram is given which permits the calculation of the aberrations of off-axis systems, taking into account anamorphosis due to the grating. It is preferable to work with the deformations of the wavefront rather than Seidel coefficients because in this way anamorphosis can be treated in a simple form. As examples, the aberrations of the Ebert and the Czerny-Turner spectrographs are calculated.
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