Designed for use with the full-frame Canon RF-mount mirrorless cameras, the Canon RF 15-35mm f/2.8L IS USM offers a wide-angle focal length range suitable for photography applications from landscape to documentary shooting. Its constant bright f/2.8 maximum aperture makes it possible to work in a variety of available lighting and affords a greater control over depth of field. Optically, the lens design incorporates two UD (Ultra-Low Dispersion) elements and three aspherical elements to correct various aberrations for clearer, sharper and more accurate imagery. To reduce backlit flaring and ghosting in harsher lighting conditions, an Air-Sphere Coating (ASC) has been applied to the lens elements. This versatile 15-35mm wide-angle lens is driven by a Dual Nano USM (Ultrasonic Motor) focus system which combines both a ring-type USM and the STM (Stepping Motor) mechanism to achieve fast, smooth, and almost silent autofocusing capabilities that benefits both still and video shooting; If required, full-time manual override for refined focusing is available when working in the the one-shot AF mode. An integrated Control Ring provides intuitive control over exposure settings, including aperture, ISO, and exposure compensation, from the lens itself. An Optical Image Stabiliser, which helps to minimise the appearance of camera shake by five stops, is built into the lens design for sharper handheld shooting, especially in challenging lighting conditions. In addition to the weather-sealing that renders the lens dust- and moisture-resistant, the front and rear elements of the lens received a fluorine coating to resist fingerprints and smudges as well as to significantly ease the cleaning of the lens. The lens features a rounded nine-blade diaphragm that contributes to a pleasing bokeh quality.
