Sigma 18-50mm f/3.5-5.6 DC Aspherical Zoom Lens for Olympus and Panasonic Digital SLR Cameras Sigma lens made specifically for Olympus digital SLR camera bodies; standard zoom lens Aspherical lens elements provide high level of optical performance 18-50mm focal length f3.5-5.6 maximum aperture 9.8-inch minimum focusing distance; macro magnification ratio of 1:3.5