Canon EF 16-35mm f/4L IS USMCanon EF 16 35mm f 4L IS USM Features High performance L series ultra wide zoom lens in a compact design and Optical Image Stabilizer for up to four stops of correction*. Three aspheric lens elements, including a large diameter aspheric lens, help correct aberration. Two UD lens elements help reduce chromatic aberration from the center to the periphery throughout the entire zoom range for excellent image quality with high resolution and contrast.