Figure 5: Principle of beam recombiner for blind phasing in the planet image: the star (S) and planet (P) images in the recombined focal plane Ffp are separately re-imaged, in the Michelson mode, through lenses L and sets of zoom lenses ZL onto cameras IC. N mirrors PM with piezo-ceramic mounts provide the common fast phasing needed to compensate atmospheric effects for both the star and planet. Slower delay lines DL provide the additional differential phasing, a priori known, needed to compensate the first-order departure from isoplanaticity of Michelson arrays, and the higher orders caused by aberrations in the optical train. Different zoom settings can be used for the star and planet images.