Editing Optical telescope (section)

===Design variants===
Many types of telescope fold or divert the optical path with secondary or tertiary mirrors. These may be integral part of the optical design ([[Newtonian telescope]], [[Cassegrain reflector]] or similar types), or may simply be used to place the eyepiece or detector at a more convenient position. Telescope designs may also use specially designed additional lenses or mirrors to improve image quality over a larger field of view.
<!--no special reason to mention a Maksutov telescope here, it is a rare type; the Cassegrain is the "grandfather" of all these designs. Also, folding the optical path alone, ''e.g.'' by flat mirrors, should not reduce the field of view-->