Olympus M ED 9-18mm f/4.0-5.6 micro Four Thirds Lens for Olympus and Panasonic Micro Four Third Interchangeable Lens Digital Camera Wide-angle zoom lens is designed for Micro Four Thirds mirrorless cameras and provides an 18-36mm equivalent focal length range. Two Dual Super Aspherical elements, along with one high refractive index element and an aspherical element, reduce spherical aberrations and distortions throughout the zoom range for improved sharpness with minimal distortion. One extra-low dispersion element suppresses color fringing and chromatic aberrations for greater clarity and color accuracy. Movie & Still Compatible (MSC) autofocus system benefits both photo and video applications due to its smooth, quiet, and fast performance. Retractable lens design with a locking button maintains a compact profile when the lens is not in use.