Multilayer field evaporation patterns of the fee metals, Ir, Pt, Rh, and the bcc metals, W, Ta, Mo, exhibit sharp networks of dark zones. These patterns are explained as ion-optical effects resulting from deviations of ion-trajectories from an exactly radial projection, as the emitter is a polyhedron rather than a sphere. Step widths on vicinals of major zone lines are retained during progressing evaporation, thereby projecting the ions into fixed directions while keeping the zone image itself dark. The bright [110] zones on fee metals reflect a focusing effect of long atom chains across the zones. Circular intensity features around the basal planes depend upon the step-wise shift of local magnification each time a residual central plane collapses. If as we surmise multilayer desorption image features are predominantly due to tip morphology, they should also be contained in the conventional field ion image, although partially hidden by brightness effects due to varying local gas supply and the large scattering disc of a single atom image. Using multilayer sequences of field ion micrographs we map the location of each atom before it evaporates as a small dot to simultate the sharpness of a single ion spot of a field desorption image. We also use another less subjective photographic superposition method. As these FIM techniques display the three essential features of the multilayer FDM image, the hypothesis of general pre-evaporation local surface migration needs not to be invoked for explaining the FDM image.