Specimens that are flat are best not placed on the two flat surfaces, because each set of pictures then captures the flat surface perfectly, but the area with high curvature connecting the flat surfaces is usually captured (and thus reconstructed) less well, with little overlap between the two photograph sets. It is therefore advisable to place the specimens on edge on a support (e.g. on modeling clay; remember to use a plastic film so that no chemicals from the clay contaminate the specimens), so that the flat surfaces are vertical. When the flat surfaces face the camera, large angles can be covered between photographs; whereas the edge-on positions require small intervals (