Characterized by its versatile zoom design, image stabilization, and relatively lightweight and compact design, the EF 70-200mm f/4L IS USM is a Canon L-series lens spanning a useful portrait-length t espandi...o medium telephoto range. The constant f/4 maximum aperture allows you to maintain a consistent exposure throughout the zoom range and also contributes to the sleeker form factor when compared to other 70-200mm lenses.