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. 2018 May 1;9:1756. doi: 10.1038/s41467-018-04186-9

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Final design properties. a Layout of the final design. The image plane is tilted by 1.8°. b Root-mean-square wavefront error (RMS WFE full-field display (FFD for the final design. All points across the FOV are diffraction limited. The peak-to-valley freeform departures from the base sphere for the c primary mirror, d secondary mirror, and e tertiary mirror are 122 μm, 15 μm, and 240 µm, respectively. The gradient of the freeform departure for the f primary, g secondary and h tertiary mirrors are 0.10°, 0.0027°, and 0.18°, respectively