Aplanatic two mirror telescope from near-normal to grazing incidence.
Surface equations for strictly aplanatic two-mirror telescopes of any configuration are given. They were used in a comparative performance analysis of the general Cassegrainian configuration as it changes continuously from near-normal to grazing incidence. The configuration of optimum performance, which resembles Schwarzschild aberration-free two-mirror telescope, is analyzed in some detail.
Korsch
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