Prime portrait-length lens is designed for Canon EF-mount full-frame-format DSLRs and 35mm film cameras. It is also compatible with APS-C format DSLRs, where it will provide a 35mm-equivalent focal length of 136mm. Fast f/1.4 maximum aperture benefits working in difficult lighting conditions and also enables extensive control over focus placement for shallow depth of field and selective focus applications. One aspherical element and six elements made from anomalous partial dispersion glass help to suppress chromatic aberrations for greater clarity and color accuracy around subject edges, regardless of the aperture setting in use. Based on the Planar optical concept, this apochromatic lens virtually eliminates both chromatic and spherical aberrations in order to reduce color fringing and color artifacts in front of and behind the plane of focus. A floating element design places variable air gaps between select lens groups to realize consistent performance throughout the focusing range, from 2.6′ to infinity. Zeiss T* anti-reflective coatings have been applied to each lens surface to help minimize reflections in order to provide greater image clarity, contrast and color fidelity. Manual focus design is accentuated by a rubberized focusing ring, 261° focus ring rotational angle, an inset dial window, and bright, high-visibility yellow depth of field and distance scale markings. An internal focusing mechanism maintains the overall lens length and, benefitting the use of circular polarizers and graduated neutral density filters, the front filter thread does not rotate during use. Rounded nine-blade diaphragm contributes to a pleasing out-of-focus quality. The sophisticated optical system is housed within an all-metal lens barrel, which is built with the narrowest of design tolerances for refined precision and durability. This ZE-series lens supports Canon DSLRs’ electronic interface for camera-based control over exposure settings and in-camera focus confirmation.