The Canon RF 15-35mm F2.8L IS USM is a fast, wide zoom lens for Canon's full-frame mirrorless system. It features 16 elements, including 2 aspherical and 3 UD. A Nano USM motor moves the focusing group quickly and quietly. Its built-in image stabilization system can reduce shake by up to 5 stops, according to Canon. Being an 'L' lens, the RF 15-35 has excellent build quality and is weather-sealed.