4 August 2010 Pancake ELT: a practical design for an Extremely Large Telescope
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In this paper we present optical designs for an entirely new approach to extremely large telescopes and telescopes with spherical primary mirrors. The key feature is a novel optical system referred to as the improved spherical aberration corrector (ISAC). This corrector works exceptionally well for post prime focus applications, as well as for Cassegrain and Couder/Schwarzschild-like optical systems with both spherical primary and spherical secondary mirrors. The Couder/Schwarzschild configuration also adapts to a pancake configuration where the telescope is physically shorter than its aperture.
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Mark R. Ackermann, Mark R. Ackermann, John T. McGraw, John T. McGraw, Peter C. Zimmer, Peter C. Zimmer, } "Pancake ELT: a practical design for an Extremely Large Telescope", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773320 (4 August 2010); doi: 10.1117/12.857062; https://doi.org/10.1117/12.857062

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