Covering a useful and familiar range with a svelte form factor, the Olympus M.Zuiko Digital ED 12-45mm f/4 PRO is a 24-90mm-equivalent zoom for Micro Four Thirds mirrorless cameras. Distinguished by its f/4 constant maximum aperture, this lens strikes a balance between a bright design and a highly compact design to suit its use in everyday situations. Myriad specialized elements are incorporated into the optical design, which help to suppress spherical aberrations, color fringing, and distortion in order to produce sharp, color-accurate imagery. A ZERO coating is also featured, which controls flare and ghosting for improved contrast when working in bright and backlit conditions. Complementing the optics is a Movie & Still Compatible autofocus system, which achieves fast, smooth, and silent focusing performance, and a maximum 0.25x magnification throughout the zoom range to suit working with close-up subjects. Additionally, the lens is weather-sealed to enable its use in trying weather conditions.