The Canon RF 135mm f/1.8 L IS USM offers an engaging mixture of high sharpness and shallow depth of field, making it an ideal choice for portrait subjects. Benefitting this desirable combination is an advanced L-series optical design, robust and weather-sealed construction, and fast AF along with dependable image stabilization for intuitive use. Three ultra-low dispersion elements control a variety of aberrations in order to achieve high sharpness, clarity, and accurate color rendering. The rounded nine-blade diaphragm contributes to a pleasing bokeh quality. Customizable Lens Function buttons on the barrel permits intuitive tactile control and rapid access to shooting settings. Fluorine coating on the front element helps repel moisture, dust, and fingerprints and is also easier to clean.