Canon 180mm f3.5L Macro 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 180mm. With a max aperture of f3.5 at 180mm, this is a moderately fast lens.
Canon 180mm f3.5L Macro USM is weather sealed which makes it an ideal lens for outdoor use, especially when coupled with a weather sealed camera body.