Schmidt–Newton telescope

A Schmidt–Newton telescope or Schmidt–Newtonian telescope is a catadioptric telescope that combines elements from both the Schmidt camera and the Newtonian reflector. In this telescope design a spherical primary mirror is combined with a Schmidt corrector plate, which corrects the spherical aberration. The resulting system has less coma than a reflecting telescope with a parabolic mirror (which is free of spherical aberration but not free of coma). The design uses a 45° flat secondary mirror to view the image, as in a standard Newtonian telescope.

Schmidt–Newton telescope

A Schmidt–Newton telescope or Schmidt–Newtonian telescope is a catadioptric telescope that combines elements from both the Schmidt camera and the Newtonian reflector. In this telescope design a spherical primary mirror is combined with a Schmidt corrector plate, which corrects the spherical aberration. The resulting system has less coma than a reflecting telescope with a parabolic mirror (which is free of spherical aberration but not free of coma). The design uses a 45° flat secondary mirror to view the image, as in a standard Newtonian telescope.