18 July 2014 A wide field corrector with loss-less and purely passive atmospheric dispersion correction
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Abstract
A 2.5 degree field diameter corrector lens design for the Cassegrain focus of the VISTA 4 meter telescope is presented. It comprises four single elements of glasses with high UV transmission, all axi-symmetric for operation at the zenith. One element is displaced laterally to provide atmospheric dispersion correction. A key feature, especially beneficial for the VISTA application, is that the ADC element can be mounted so it is driven simply by gravity; thus its operation needs no motors, encoders, cabling, or software control. A simple mechanical design to achieve this and the optical performance details are described.
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Peter Gillingham, Will Saunders, "A wide field corrector with loss-less and purely passive atmospheric dispersion correction", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 915161 (18 July 2014); doi: 10.1117/12.2054707; https://doi.org/10.1117/12.2054707
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