Olympus Zuiko 12-60mm f/2.8-4.0 Digital ED SWD Lens for Olympus Digital SLR Cameras
The Zuiko Digital ED 12-60mm f2.8-4.0 SWD lens is a high-performance standard zoom lens that covers a zoom range equivalent to 24 to 120mm on a 35mm camera lens. Special optical glass elements are used to correct various types of aberrations, while the 100 percent digital design ensures high-definition performance with clear, crisp images from edge to edge. This lens also boasts impressive close-up shooting capability, allowing users to shoot from as close as 25cm throughout the zoom range.The lens’ autofocus is powered by Olympus’ breakthrough SWD. Designed to be the world’s fastest AF system, this extraordinary autofocus drive provides both high speed and high precision while operating with lower noise than ever. Optimized for use with the new E-3, this lens enables the camera to demonstrate the full power of its high-speed capability, providing the fastest autofocus available in the world using a standard zoom lens.About Supersonic Wave Drive TechnologyOlympus-proprietary SWD technology has enabled an ultra-fast, whisper-quiet, high-precision AF system. Two compact, high-powered Supersonic Wave Drive devices power autofocus at an ultra-high speed by exciting unique elliptical oscillations, while an ultra-compact 5.3mm x 4.3mm optical encoder detects and controls the lens drive position using direct rotation detection without reduction gear. This  enables it to achieve a level of precision that’s accurate to 5 microns (5/1000 mm). When used in combination with the new E-3, which offers improved AF computation and lens-body communication rates, the SWD motors provide the fastest focusing speed of approximately 170 ms (0.17 seconds).