High precision and flexibility to match fixed focal length lenses. With a brilliant optical design and speedy performance, the RF delivers flexibility, performance and image quality in one discreet package. Dust- and water-resistant design. For reliable performance even when weather conditions get difficult, the RF lens features dust- and water-resistant construction in the lens mount, switch panel and all rings. High image quality. The RF lens is able to render image quality at f/2. With an extra stop of light, this means faster shutter speeds or lower ISOs for enhanced image quality, and marvelous performance when shooting movies. Vibration and shock resistance. Engineered to accommodate its optical system, the RF lens features vibration and shock resistance in the lens barrel, helping to maintain focus and settings even in turbulent situations.