Figure 5: Densified-pupil image formation through fibers. The single-mode fibers F, carrying light from distinct telescopes, are bundled in such a way as to reproduce the entrance aperture's geometry, with adequate densification. All output beams are superposed on the CCD sensor. An interference peak appears if the beams are phased, forming a direct image of the object (here a binary star) on the CCD. The field limitation of densified-pupil imaging is here being defined by the fiber's lobe, matched to the sub-pupils f-number at the fiber inputs. A ring array is shown, but other shapes can be used.