Canon 16–35mm f/2.8L III USM Super Wide Angle Zoom Lens - EF Mount

The Canon 16–35mm f/2.8L III USM Super Wide Angle Zoom Lens - EF Mount offers a constant f/2.8 aperture and full frame coverage. The USM (Ultrasonic Motor) makes mechanical operation extremely quiet, and version "III" indicates an improved optical design which results in outer/corner sharpness.

This zoom incorporates a ring-type USM which, when combined with a high-speed CPU and optimized algorithms, delievers fast and accurate AF autofocus. If you prefer, there is a manual override. The lens maintains a sharp focus in low light. It also create a nice bokeh effect due to the rounded, 9-blade aperture diaphragm. Canon added a specialized coating to minimize flare and ghosting effects. The lens construction includes two UD lens elements to minimize chromatic aberration and eliminate color blurring of the subject on high resultion and contrast images.

In most inclement weather you can rest assured that this lens seals make it dust- and water-resistant.

Constant f/2.8 Maximum Aperture

The EF 16–35mm f/2.8L III USM has a bright constant maximum aperture of f/2.8, which provides superb control over depth of field and the ability to maintain the same aperture throughout the zoom range. This is particularly helpful when shooting outdoors at dusk or in inclement weather, or indoors in dimly lit rooms. At f/2.8, the EF 16–35mm f/2.8L III USM offers a bright view when composing images using the camera's viewfinder.

Significant Improvements in Outer / Corner Sharpness

The EF 16–35mm f/2.8L III USM features a new optical design engineered to deliver images of remarkable clarity and depth. It employs two large-diameter double-surface GMo lenses plus a ground aspherical lens to help decrease distortion, curvature of field and astigmatism. Two UD lenses help to reduce chromatic aberration, leading to precise color rendition, accurate edge-to-edge detail plus excellent contrast throughout the lens's zoom range. This results in sharp landscapes, reduced distortion in the edges of the frame and an overall improvement in image quality no matter the subject.

Subwavelength Coating (SWC) and Air Sphere Coating (ASC)

The EF 16–35mm f/2.8L III USM features both Subwavelength Coatings (SWC) and Air Sphere Coatings (ASC) on lens elements to help combat reflections, flare and ghosting, and deliver clean images with reduced aberrations from reflected light. Subwavelength Coatings help prevent reflections by arranging an array of wedge-shaped nanostructures on the lens's surface that are smaller than the wavelength of visible light and are able to help control reflection and flare. Air Sphere Coating technology puts an ultra-low refractive layer on the lens element designed to significantly reduce both flare and ghosting. These coatings, in concert with the EF 16–35mm f/2.8L III USM's overall optical formula, help to deliver a clean image to the camera's sensor, which can decrease the need for post-production correction and enhancment.