Powerful and bright l-series medium telephoto lens featuring 17 optical elements in 12 groups excellent image quality with three ud lenses perfectly placed to reduce chromatic aberration, and air sphere coating (asc) to prevent ghosting optical image stabilization at up to 5.5 stops of shake correction. up to 8 stops* of shake correction when paired with eos r series cameras featuring in-body image stabilizer (ibis) nano usm for af drive that is both fast and smooth, and is also quiet enough to use when shooting movies two programmable lens function buttons (one on the top and one on the side), previously only available on canon super-telephoto lenses
