The Ritchey-Chretien telescopes are a variant of the Cassegrain telescopes but with hyperbolic primary and secondary mirrors that are designed to eliminate off axis optical errors.
The Ritchey-Chretien telescopes are a variant of the Cassegrain telescopes but with hyperbolic primary and secondary mirrors that are designed to eliminate off axis optical errors.
The Ritchey-Chretien telescopes are a variant of the Cassegrain telescopes but with hyperbolic primary and secondary mirrors that are designed to eliminate off axis optical errors.
The Ritchey-Chretien telescopes are a variant of the Cassegrain telescopes but with hyperbolic primary and secondary mirrors that are designed to eliminate off axis optical errors.