Canon RF 100-300mm f/2.8L IS USM LensCanon RF 100 300mm f 2. 8L IS USM Lens The RF 100 300mm F2. 8L IS USM lens combines the best of both worlds, offering the remarkable focusing speed, sharpness, and performance of a prime lens along with the versatility of a zoom. Its fast f 2. 8 aperture throughout the entire zoom range ensures excellent low light capabilities. The lens features new coated internal lens elements that contribute to exceptional sharpness. With a 5. 5 stop Image