Sigma 55-200mm f/4-5.6 DC Telephoto Zoom Lens for Olympus and Panasonic Digital SLR Cameras Sigma lens made specifically for Olympus digital SLR camera bodies; telephoto zoom lens Compact design is just 3.3 inches long 55-200mm focal length f4-5.6 maximum aperture 43.3-inch minimum focusing distance; maximum magnification ratio of 1:4