Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT

  title={Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT},
  author={Gerardo {\'A}vila and Gero Rupprecht and Jacques Maurice Beckers},
  booktitle={Other Conferences},
The need for atmospheric dispersion correction on large telescopes is well known. Therefore it was decided to implement atmospheric dispersion correctors for FORS, the focal reducer/spectrographs of the ESO very large telescope. The boundary conditions at the VLT Cassegrain foci excluded however all previously known ADC concepts and therefore we were forced to design a new one, the longitudinal atmospheric dispersion corrector (LADC) consisting of two thin prisms with variable distance. This… 
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