Key Features EF-Mount Lens/Full-Frame Format Aperture Range: f/1.4 to f/22 One Aspherical Element Air Sphere Coating Ring-Type Ultrasonic Motor AF System Optical Image Stabilization Weather-Sealed Design, Fluorine Coating Rounded 9-Blade Diaphragm Show Less Distinguished by its fast design and IS capabilities, the EF 85mm f/1.4L IS USM from Canon is a short telephoto prime well-suited to portraiture applications. As an L-series lens, it is characterized by a sophisticated optical layout that includes one glass-molded aspherical element to greatly reduce spherical aberrations and distortion for improved sharpness and clarity