title: Aplanatic two mirror telescope from near-normal to grazing incidence.
abstract: 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.
authors.forename: D
authors.initials: D
authors.lastname: Korsch