Figure 4: Comparison of image formation at the combined focus of 27 phased apertures with Fizeau (left) and densified (right) pupils. Top: entrance pupil with 27 sub-apertures 100 times smaller than the ring (left), and the densified exit pupil obtained from the same entrance pupil (right) to attenuate the side lobes of the spread function (left, second line). The following rows show corresponding images for a binary and a sextuple star. The densification intensifies the images at right 10 000 times since the shrunk diffraction envelope concentrates the energy from the halo of sidelobes, but the field extent is decreased.