Kitt Peak National Observatory 4 meter telescope Risley prism system

Details Kitt Peak National Observatory 4 meter telescope Risley prism system Kitt Peak National Observatory 4 meter telescope Risley prism system

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..328s&link_type=abstract

IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 1 (A87-36376 15-35). Bellingha

Physics

Optics

1

Atmospheric Correction, Prisms, Telescopes, Angles (Geometry), Atmospheric Effects, Fabrication, Gradient Index Optics, Wave Dispersion

Scientific paper

Light that arrives from a star that is not at zenith is refracted by the atmosphere; blue light is in this fashion made to deviate more than red. The Risley prism used by the Kitt Peak 4-m telescope compensates for atmospheric dispersion up to 60 deg from the zenith in the visible wavelength range. The prism apparatus consists of a pair of contrarotating composite prisms, and has been found to yield good axial performance under converging light at f/8 and f/30. The quality of the field imagery obtained is a function of the properties of the primary-secondary mirror configuration.

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