The RF mount design inherits the superior optics of the EF400mm f/2.8L IS III USM, offering high image quality and light weight. Two fluorite lenses and a super Ultra-low Dispersion (UD) lens provide high-resolution, high-contrast imaging performance. This is Canons flagship super-telephoto lens for professionals and advanced amateurs, offering clear, sharp, high image quality with no color bleeding. The light weight enhances mobility and allows photographers to capture stunning high-quality images. This lens is equipped with a switch that allows the user to select from three manual focus speeds. It also features a thermal barrier coating to prevent the lens body from accumulating heat, when used in the hot sun. The image stabilization effect of the lens alone is 5.5 stops*.

* According to CIPA standards.