Canon RF 28-70mm f/2L USM LensThe Canon RF 28 70mm f 2L USM Lens features offers unparalleled performance throughout its zoom range. With L series optics, the RF 28 70mm lens offers the flexibility and superlative performance from a 28 70mm focal length. The RF 28 70 f 2L USM lens is a large diameter, standard L zoom lens with a bright f 2. 0 constant aperture across the entire zoom range. RF lenses are intended for professional photographers, high end amateurs, and low light