Features All new high ratio zoom lens with VR, SWM and ED glass Silent Wave Motor for whisper quiet and fast AF Flexible 36-180mm focal length equivalent Enviromentally friendly glass elements G type lens (no aperture ring) for 1/3 top accuracy Two ED glass elements for superior quality in both film and digital Standard zoom is designed for FX-format F-mount cameras, however can also be used with DX models where it provides a 36-180mm equivalent focal length range. Constant f/4 maximum aperture offers consistent performance throughout the zoom range. Three aspherical elements are used to reduce spherical aberrations and distortion in order to realize sharp imagery with accurate rendering. Two extra-low dispersion elements greatly reduce color fringing and chromatic aberrations in order to produce greater clarity and color accuracy. Both a Nano Crystal Coat and a Super Integrated Coating have been applied to individual elements to suppress internal reflections, flare, and ghosting for improved contrast and color accuracy when working in strong lighting conditions. Silent Wave Motor affords quick, quiet, and precise autofocus performance along with full-time manual focus override. An internal focusing design is also used, where only the internal lens groups are moved during focusing, to maintain the overall length of the lens during use and to promote faster focusing speeds. VR II (Vibration Reduction) image stabilization helps to minimize the appearance of camera shake to benefit shooting handheld in difficult lighting conditions. Rounded nine-blade diaphragm promotes a pleasing out of focus quality that benefits the use of shallow depth of field techniques.