The Canon RF 135mm f/1.8L IS USM lens is a medium-telephoto focal length with an extremely bright maximum aperture lens designed for Canon RF full-frame cameras ideal for portrait subjects. With the bright f/1.8 maximum aperture, the unit affords extensive control over depth of field for selective focus applications and also benefits working in low-light situations. The lens carries three ultra-low dispersion elements control a variety of aberrations in order to achieve high sharpness, clarity, and accurate color rendering. The Nano USM delivers fast, accurate, and near silent autofocus performance to benefit both photo and video applications. The lens is also Weather-sealed design for reliable use in inclement conditions.