Canon RF 70-200mm f/4.0L IS USM LensCanon RF 70 200mm f 4. 0L IS USM Lens Stay agile and flexible with the RF 70 200mm F4L IS USM and always get the shot. With its useful 70 200 mm focal length it is a supremely versatile lens for all manner of subjects, from portraits to wildlife. And with a constant f 4 aperture throughout the zoom range, it gives stunning bokeh at its widest aperture, perfect for separating your subject from either foreground or background. L series image quality