Ritchey-Chrétien (RC) Telescope collimation

The tasks: The problems:
  1. Adjusting one of the mirrors or the focuser affects the alignment of the others
  2. Mechanical axis is rarely also the optical axis
  3. Most tools wrongly assume that the optical axis is the same as the mechanical axis
  4. Mirror distance is critically important
  5. Some models have the focuser attached to the primary mirror assembly, some even without collimation capabilities.
  6. Central rings in the mirrors are not always at the optical center
  7. Most models have no adjustment options to center the mirrors

Collimation using stars at night

Collimation during daylight

Further reading

Last page update : 2024-05-03T20:47Z -- Hans Lambermont