The design concept of a high speed stellar spectrograph for gratings up to a ruled length of 128 mm and for dispersions from 80 Å/mm to 20 Å/mm is described. It consists of a mirror collimator and two exchangeable mirror cameras. The impinging and diffracted bundle of light is corrected by means of concentric menisci which are exchanged together with the camera. Information is given about design details and the corrections obtained.
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