Fig. 3.

Zernike-based aberrations FFDs after an astigmatism surface. Full-field displays (FFDs) calculate and plot the magnitude and orientation of a given aberration over a set of points that sample the full FOV. The aberrations of the system shown in Fig. 2 before adding any freeform shapes are shown in the FFDs for a defocus (Z4), b astigmatism (Z5/6), and c coma (Z7/8). The aberrations after the addition of an astigmatism shape to the primary and tertiary mirrors are shown in the FFDs for d defocus (Z4), e astigmatism (Z5/6), and f coma (Z7/8). Other aberrations are negligible when plotted at this scale, which is indicated below f