The Leica TS-APO-Elmar-S 120 mm f/5.6 ASPH. allows control of perspectives and the location of the plane of focus. Perspectives remain unchanged when altering the viewing angle. This allows the correction of converging verticals in architectural photos, for example. Tilting the lens permits precise placement of the plane of focus so that a flat object viewed from the side is completely sharp at maximum aperture. Conversely, tilting the plane of focus in the opposite direction to the elongation of the subject may be used to significantly reduce depth of focus.
