The M.Zuiko Digital 17mm f/1.8 from Olympus is a 34mm equivalent wide-angle prime for Micro Four Thirds mirrorless cameras. The wide field of view pairs with the bright f/1.8 maximum aperture to benefit working in difficult lighting conditions, and it also offers increased control over the depth of field for working with selective focusing techniques. The optical design makes use of aspherical and high refractive index glass elements to control spherical aberrations and distortion throughout the aperture range for increased sharpness and clarity. Additionally, a Movie & Still Compatible (MSC) autofocus system is employed to deliver quick and quiet focusing performance and a manual focus clutch can be used for more intuitive adjustment and control over focus.