The simulation of field‐ion images by computation of the position of atoms which lie within an outer shell of given thickness on a spherical crystal has been extended to spherical crystals of a variety of structures. These include the hexagonal lattice, the hexagonal close‐packed structure and a few of the common superlattices. The consequences of the invisibility of one atomic species in ordered alloys has been investigated. The results show that computations are in fact necessary for a detailed interpretation of the field‐ion image.