The Canon EF 85mm f/1.4L IS USM is a fast, portrait-optimized short telephoto prime lens designed for full-frame EF-mount DSLRs, delivering a 136mm equivalent focal length on APS-C bodies. Its bright f/1.4 aperture provides excellent low-light performance and shallow depth-of-field control, ideal for selective focus techniques. The advanced optical design includes a glass-molded aspherical element to reduce distortion and spherical aberrations, along with an Air Sphere Coating (ASC) that suppresses flare and ghosting in backlit scenes for superior contrast and color accuracy. Built for both performance and durability, the lens features a four-stop-effective optical image stabilization system for steady handheld shooting, a fast and quiet ring-type Ultrasonic Motor (USM) with full-time manual focus override, and weather-resistant construction with a fluorine coating on exposed elements to guard against dust, moisture, smudges, and fingerprints. A rounded nine-blade diaphragm further enhances image aesthetics by producing smooth, pleasing bokeh.