Characterized by a revamped optical design, the Canon EF 16-35mm f/2.8L III USM Lensfrom Canon EF 16-35mm f/2.8L III USM Lensis a workhorse wide-angle zoom and member of the well-regarded L-series of lenses. Featuring a series of specialized elements, this lens utilizes a trio of aspherical elements and two ultra-low dispersion glass elements to control a variety of aberrations for high sharpness and clarity. Both SWC and ASC coatings have also been applied to the elements in order to reduce lens flare and ghosting for increased contrast and color accuracy.

Complementing its optical prowess, a ring-type Ultrasonic Motor offers fast, smooth, and near-silent autofocus performance, which is further benefitted by full-time manual focus operation and an internal focusing design. The lens is both water and dust-resistant, and fluorine coatings have also been applied to the front and rear elements to protect against fingerprints and smudges from affecting image quality.

EF-Mount Lens/Full-Frame Format    Aperture Range: f/2.8 to f/22    Three Aspherical and Two UD Elements    SWC, Air Sphere, and Fluorine Coatings    Ring-Type Ultrasonic Motor AF System    Weather-Sealed Construction    Rounded 9-Blade Diaphragm

Wide-angle zoom 16-35mm lens is compatible with full-frame Canon EF-mount DSLRs, as well as APS-C-sized models where it will provide a 25.6-56mm equivalent focal length range.

Constant f/2.8 maximum aperture offers consistent performance and excellent light transmission throughout the zoom range.

Two large-diameter glass-molded dual-surface aspherical elements and one ground aspherical element help to minimize distortions and spherical aberrations throughout the zoom range in order to maintain edge-to-edge sharpness and illumination.

Two ultra-low dispersion elements are used to minimize chromatic aberrations as well as eliminate color blurring around the edges of subjects.

Both a Subwavelength Coating (SWC) and an Air Sphere Coating (ASC) have been applied to lens elements to reduce backlit flaring and ghosting for maintained light transmission and high contrast in strong lighting conditions.

A ring-type Ultrasonic Motor (USM), along with an internal focusing system, high-speed CPU, and optimized AF algorithms, are employed to deliver fast, precise, and near-silent autofocus performance as well as full-time manual focus override.

As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.

Protective fluorine coating has been applied to the front bulbous element to resist fingerprints and smudges and to make cleaning significantly easier.

Rounded nine-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.

Related Questions and Answers

Q: 1. Under specs BH writes Image Stabilization: Yesis this really true?

A: NO

Q: 2. Anyone have any experience with using this lens on a C500mkii or the new C300mkiii?

A: Works great on both cameras.

Q: 3. Will this lens work on a canon t6i? Is it image stabilized?

A: I don't know, I use it on 5d Mark IV

Q: 4. This lens is good for sharp pic landscape as 16-35 f/4?

A: Yes great lens

Q: 5. How well does this lens handle night skies? Star coma in particular.

A: The Canon EF 16-35mm f/2.8L III USM Lens has a wide f/2.8 aperture. So the lens will handle night skies well.

Q: 6. Does this lans moves externally zooming in and out need to balance on Ronin?

A: This lens offers an internal zoom.

Q: 7. How quick and accurate is the autofocus on this?

A: The lens is very fast and tack-sharp. For journalism, it is a 'must have'. But you must remember that your camera has a lot to do with lens performance. I use 1Dx cameras to get the top performance from my lenses.

Q: 8. What is new about this 16-35mm lens over the mark ii? From all specs it appears the same. Is it just improved sharpness and lens distortion on the wide end? If someone could explain that would be super helpful.

A: I rented the old version and for an L lens, it was not very sharp. Maybe this one is better in that regard.

Q: 9. Which canon camera body goes perfect with this lens?

A: Any full frame camera like the 5d mark iv. This lens is super sharp and very versatile. I use it on a 1DX Mark ii for both photo and video to get nice wide angle perspectives

Q: 10. is this parfocal lens?

A: The 16-35mm is not parfocal. However, Canon make a 15.5-47mm T2.8 lens that is parfocal: https://bhpho.to/3j27mT1