Powerful and bright L-Series medium telephoto lens featuring 17 optical elements in 12 groups. Fast F1.8 maximum aperture for great control over depth of field and bokeh, low-light shooting and video recording, with fast and reliable autofocus. Excellent image quality with three UD Lenses perfectly placed to reduce chromaticaberration, 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.