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AbstractA slitless field spectrograph for Cassegrain telescopes has been designed. It is based on the focal reducer optical arrangement and grating prisms. Together with the "multiple diaphragm method" not only a gain in limiting magnitude of 3 to 4 magnitudes has been achieved, but also other drawbacks of the classical objective prism camera are avoided.doi:10.1017/s0252921100104233 fatcat:afbaoudg7fg7xmbunkygyqhdzu