Sigma 18-125mm f/3.5-5.6 DC IF Aspherical Zoom Lens for Olympus and Panasonic Digital SLR Cameras Sigma lens made specifically for Olympus digital SLR camera bodies; telephoto zoom lens Special low-dispersion and aspherical lens elements provide high level of optical performance 18-50mm focal length f3.5-5.6 maximum aperture 19.6-inch minimum focusing distance; zoom-lock switch