The Canon RF 85mm f/1.2L USM is also characterized by its advanced optical design to produce well-corrected imagery. The fast f/1.2 design excels in difficult lighting conditions and also benefits from working with shallow depth of field and selective focus techniques. In addition to this, an ultra-low dispersion element and one aspherical element are also featured to further control various aberrations and distortion for great sharpness and resolution. A unique Control Ring is also integrated into the lens design for intuitive control over exposure settings from the lens itself. Exceptionally bright f/1.2 maximum aperture affords extensive control over depth of field for selective focus applications and also benefits working in low-light situations. One aspherical element and one UD element also help to control aberrations and distortions for sharper, clearer image quality. Ring-type Ultrasonic Motor (USM), along with optimized focusing algorithms, a high-speed CPU, and an internal focusing design, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override. As a member of the esteemed L-series, this lens has a weather-resistant design that protects against dust and moisture to enable its use in inclement conditions.