Panasonic Lumix S PRO 70-200mm f/4 O.I.S. LensCovering a versatile and popular range of focal lengths, the Lumix S PRO 70 200mm f 4 O. I. S. from Panasonic is an L mount telephoto zoom featuring an f 4 constant maximum aperture. A sophisticated optical design is employed, which incorporates a series of aspherical, low dispersion, and high refractive index elements, to control a variety of aberrations, color fringing, and distortion for sharp, clear, well corrected imagery throughout the zoom