As a top performer , the RF600mm f / 4L IS USM is a supertelephoto lens that delivers stunning image quality for sports and wildlife photography . With up to 5.5 stops of image stabilisation and ultra-fast focusing , get clean and crisp images while nailing critical moments . Coated in heat-resistant white paint and with L-series robust build to withstand rigorous professional use , this lens allows you to shoot confidently outdoors .