The Canon RF 85mm f/1.2L USM DS is a unique portrait-length prime, characterized by its flattering focal length, exceptionally bright maximum aperture, and advanced optical design. Beyond the bokeh-optimized design, the optical layout of this lens incorporates a Blue Spectrum Refractive Optics element; a specially developed element that helps to nearly eliminate chromatic aberrations and color fringing for notable clarity and color accuracy. Individual elements also feature an Air Sphere Coating to suppress flare and ghosting for high contrast and color fidelity when working in bright and backlit conditions. 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. The effect is greatest when working at f/1.2, however, the DS coating requires approximately 1.3 stops more exposure than the standard version of the lens when shooting wide open. By f/3.2, the two versions of the lens have nearly identical light transmission and performance. 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.