18 July 2014 Prime focus wide-field corrector designs with lossless atmospheric dispersion correction
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Abstract
Wide-Field Corrector designs are presented for the Blanco and Mayall telescopes, the CFHT and the AAT. The designs are Terezibh-style, with 5 or 6 lenses, and modest negative optical power. They have 2.2°-3° ields of view, with curved and telecentric focal surfaces suitable for fiber spectroscopy. Some variants also allow wide-field imaging, by changing the last WFC element. Apart from the adaptation of the Terebizh design for spectroscopy, the key feature is a new concept for a ‘Compensating Lateral Atmospheric Dispersion Corrector’, with two of the lenses being movable laterally by small amounts. This provides excellent atmospheric dispersion correction, without any additional surfaces or absorption. A novel and simple mechanism for providing the required lens motions is proposed, which requires just 3 linear actuators for each of the two moving lenses.
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Will Saunders, Will Saunders, Peter Gillingham, Peter Gillingham, Greg Smith, Greg Smith, Steve Kent, Steve Kent, Peter Doel, Peter Doel, } "Prime focus wide-field corrector designs with lossless atmospheric dispersion correction", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91511M (18 July 2014); doi: 10.1117/12.2055662; https://doi.org/10.1117/12.2055662
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