Atmospheric dispersion at prime focus

Details Atmospheric dispersion at prime focus Atmospheric dispersion at prime focus

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230..457w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Feb. 1, 1988, p. 457-471.

Physics

Optics

7

Atmospheric Optics, Atmospheric Scattering, Cassegrain Optics, Light (Visible Radiation), Astronomy, Lenses, Prisms

Scientific paper

Simple atmospheric dispersion correctors suitable for use at a Cassegrain focus introduce intolerably large aberrations at prime focal ratios. An alternative system of prisms with curved optical surfaces is described, and its aberrations evaluated, which together with a slightly modified field corrector gives good correction up to 70° zenith distance over a 40 arcmin field. A further development of the system would make low dispersion slitless spectroscopy possible at prime focus. Numerical examples are given, designed for the f/2.5 focus of the 4.2-m William Herschel Telescope.

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