Olympus Zuiko 12-60mm f/2.8-4.0 Digital ED SWD Lens for Olympus Digital SLR Cameras 12-60 millimeter f2.8-4.0 zoom lens for digital cameras (equivalent to 24-120 millimeter in 35 millimeter photography) Features Supersonic Wave Drive (SWD) technology inside to provide quiet, ultra-fast autofocus speed In combination with the Olympus E-3 DLSR, delivers the fastest autofocus speed in the world 100-percent digital design ensures high-definition performance Features special optical glass elements to correct various types of aberrations