Canon 100mm f2.8L Macro IS USM is an Auto Focus (AF) Macro Prime lens with 35mm FF max sensor coverage. When mounted on a 35mm FF sensor camera, it will give you an FF equivalent focal range of 100mm. With a max aperture of f2.8, this is a fast lens.
This lens features on optical image stabilization which helps capturing sharper images at lower shutter speeds. Canon 100mm f2.8L Macro IS USM is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.