Fig. 3.

Afocal relay optics layout (a), in which the distance t between the lens groups can be set to 272, 399 and 524 mm for correcting −10, 0 and +10 D of sphere, respectively. Transverse ray aberration curves over normalized pupil coordinates (b, d), in units of mm. Spot diagrams (c, e), in which the black circles represent the Airy disk at the central wavelengths of each range (940 & 525 nm, respectively). All diagrams correspond to 0 D of defocus.