The EF 100mm f/2.8L Macro IS USM from Canon is a versatile L-series short telephoto prime that is also well-suited for portraiture and other mid-range subjects. Also contributing to smooth and intuitive handling, a ring-type USM and internal focusing design offers quick, quiet, and accurate autofocus performance along with a full-time manual focus override.  Additionally, as an L-series lens, this 100mm f/2.8 is weather-sealed for working in inclement conditions. Short telephoto prime is designed for full-frame Canon EF-mount DSLRs, however, can also be used with APS-C models where it provides a 160mm equivalent focal length. One ultra-low dispersion (UD) element greatly reduces chromatic aberrations and color fringing for improved clarity and color accuracy. An Optical Image Stabilizer helps to minimize the appearance of camera shake to better enable working in low-light conditions and with slower shutter speeds. A ring-type Ultrasonic Motor (USM), an internal focusing design, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override. The rounded nine-blade diaphragm contributes to a pleasing out-of-focus quality that benefits the use of shallow depth of field and selective focus techniques. As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.