Canon EF 100mm Macro Lens Key Features: This short telephoto prime lens is designed for full-frame Canon EF-mount DSLRs, but can also be used with APS-C models where it provides a 160mm equivalent focal length. Ideal for macro photography, this lens offers a life-size 1:1 maximum magnification along with a minimum focusing distance of 11.8" to suit working with close-up subjects. One ultra-low dispersion (UD) element significantly reduces chromatic aberrations and color fringing for improved clarity and color accuracy. A Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions. 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. This system's effectiveness compensates for up to two stops of camera shake at 1:1 magnification, three stops at 1:2 magnification, and four stops at lower magnifications. A ring-type Ultrasonic Motor (USM) and an internal focusing design are employed to deliver fast, precise, and quiet autofocus performance, as well as full-time manual focus override. A Focus Limiter switch allows you to constrain the focusing to three different ranges for faster focusing performance: 11.8"-1.6', 1.6'-infinity, and the full 11.8"-infinity range. 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 harsh environmental conditions. An optional tripod collar is available and benefits working with the lens atop a tripod or monopod.