Auxiliary mirror
In the case of composite optical systems, an auxiliary mirror is a mirror that deflects the beam path to the side or changes its focal length . Well-known examples are
For telescopes:
- Secondary mirror in astronomical reflecting telescopes
- Secondary mirror in catadioptric systems or Schiefspieglern .
- Deflection mirror or deflection prism behind the eyepiece of telescopes
- Axial mirror in the Broken Telescope
- Zenith prism (type with mirror), zenith eyepiece for theodolites.
For other instruments:
- Reading mirror for pitch circles of older measuring instruments
- Autofocus auxiliary mirror in cameras for phase detection. If it folds up, the measuring beam goes to measure the exposure
- Illumination mirror on the microscope or the thread net eyepiece
- with xenon lamps for better alignment of the light
- the second mirror in the Sidero and Coelostat
- semitransparent measuring mirror for the mirror sextant
- Folding mirror when switching reading devices (e.g. with special cameras or theodolites)
- Oscillating mirror on the SLR camera .