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The optical design of a mirror telescope with a free aperture of 3.5 m is described. Observations can be made in the Cassegrain (RC) focus f/8, in the direct focus f/3, and in the coudé focus f/30. The results of ray tracing in the form of spot diagrams are dealt with. Some technological problems are discussed.
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H. Köhler (1968) studied this question.
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