Canon RF 600mm f/4.0L IS USM LensCanon RF 600mm f 4. 0L IS USM Lens When you need to get really close, the magnification of this 600mm super telephoto lens puts you right in the centre of the action ideal for those shooting sports, action or wildlife. Image quality is simply sublime thanks to an advanced optical design that makes use of cutting edge optical materials. An f 4 maximum aperture lets you isolate pin sharp subjects against a smooth out of focus background. Tracking fast