The Canon RF 16-28mm f/2.8L IS USM is a compact, lightweight (540g) ultra-wide zoom for full-frame mirrorless cameras. It features a constant f/2.8 aperture, 5-stop image stabilization, and weather-sealed L-series construction. With three aspherical and three UD elements, it ensures high sharpness and low distortion. Its close-focusing capability (0.2m) allows for creative shots. Unlike its sibling, it has a fixed front element, requiring a rear gel filter holder. It’s designed for travel, landscape, and video photographers needing pro performance in a smaller pack