From professional field shooting to high-speed, high-precision auto focus, the Lumix S Pro 70-200mm F2.8 O.i.s. lens (S-E70200) is a versatile, large-aperture telephoto zoom lens that delivers superior performance across the entire zoom range. This lens is expertly designed with 22 elements in 17 groups, including 2 Ued (Ultra Extra-low Dispersion) lenses and 3 Ed (Extra-low Dispersion) lenses. This optimal alignment effectively combats both axial chromatic aberration and chromatic aberration of magnification, ensuring crisp, clear images.The Lumix S Pro 70-200mm lens also features an aspherical lens that corrects astigmatism, achieving high-resolution performance. Its double focus system minimizes aberration fluctuations at close distances, resulting in high descriptive performance from the center to the corners of the frame over the entire zoom range, even with its large aperture.