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3.2.4.3 2-mirror telescopes. First surface ('primary mirror): We can take over the results of Eqs. (3.25) directly for the contributions of the primary to the total aberration. However, it is usually convenient to normalize to the final focal length / of the complete 2-mirror system rather than to retain the primary focal length /. From (2.55) / = , giving

1 yi

nJ i

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