The EF 1635mm f/2.8L III USM is an indispensable ultra wide-angle zoom lens for professional and enthusiast photographers who demand superlative operation and performance, in virtually any condition. Its 1635mm focal range provides superb
control of perspective, helping you capture pictures and movies with amazing, dramatic compositions limited only by your imagination. Combining outstanding image quality, a fast, constant aperture and a rugged design, the EF 1635mm f/2.8L III USM
delivers eye-catching results whether capturing detailed, nuanced landscapes, dramatic interiors and much more. Both still and moving images can be captured with consistent edge-to-edge sharpness, improved peripheral illumination and reduced distortio
at extreme wide angles especially important when using SLR cameras with full-frame sensors. Engineered with high-resolution photography and videography in mind, the EF 1635mm f/2.8L III USM provides the optical performance necessary for critical
applications, while delivering the renowned function and feel you’ve come to expect from Canon’s celebrated L-series lenses.
- High-performance L-series ultra-wide-angle zoom lens with constant f/2.8 maximum aperture.
- All-new optical design for significant improvements in outer and corner sharpness.
- Subwavelength Coating (SWC) and Air Sphere Coating (ASC) help to significantly reduce flare and ghosting.
- Highly resistant to dust and water intrusion, enabling shooting even in harsh conditions*.
- Circular aperture (9 blades) helps deliver beautiful, soft backgrounds.
- Inner focusing, ring USM, high-speed CPU and optimized AF algorithms for fast and accurate autofocusing.
- Full-time manual focus allows manual focus adjustment while in AF Mode.
- Fluorine coating on front and rear lens surfaces helps reduce smears and fingerprints.
High-performance L-series ultra-wide-angle zoom lens with constant f/2.8 maximum aperture.
The EF 1635mm 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 1635mm f/2.8L III USM offers a bright view when composing images using the camera’s viewfinder.
All-new optical design for significant improvements in outer and corner sharpness.
The EF 1635mm f/2.8L III USM features a new optical design engineered to deliver images ofremarkable clarity and depth a magnificentcomplement to the large, high-resolution sensors in the SLRs favored by today’s advanced
photographers. 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 means 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) help to significantly reduce flare and ghosting.
The EF 1635mm f/2.8L III USM features both Subwavelength Coatings (SWC) and Air Sphere Coatings (ASC) on its 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 Coatin
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 1635mm f/2.8L III USM’s overall optical formula, help to deliver a clean image
to the camera’s sensor, which can decreasethe need for post-production.
Highly resistant to dust and water intrusion, enabling shooting even in harsh conditions*.
Befitting an L-series lens, the EF 1635mm f/2.8L III USM is built to endure photography and moviemaking in even the harshest conditions*. It features a dust- and water-resistant construction on the switch panel, the zoom and focus rings, and on
the lens mount, helping to prevent dust and moisture from interfering with operation. When outfitted with a Canon filter, the EF 1635mm f/2.8L III USM is supremely dust- and water-resistant.
Circular aperture (9 blades) helps deliver beautiful, soft backgrounds.
Thanks to its 9-blade, circular aperture, the EF 1635mm f/2.8L III USM is capable of gorgeous, evocative out-of-focus areas and soft backgrounds throughout its zoom range. Its f/2.8 maximum aperture enables shallow depth of field, which is often
difficult to achieve with ultra wide-angle lenses and lenses with small maximum apertures. By delivering an incredible level of control over background blur, the EF 1635mm f/2.8L III USMhelps you define the mood of your image, creating impactful
photos and videos.
Inner focusing, ring USM, high-speed CPU and optimized AF algorithms for fast and accurate autofocusing.
The EF 1635mm f/2.8L III USM is engineered to provide fast, accurate operation for efficient performance across the board. It features a high-performance control CPU that drives Canon’s quick inner focusing with ring USM for quick starts
and stops. Plus, it’s programmed with optimized AF algorithms that help achieve fast, accurate focus and maintain it consistently.
Full-time manual focus allows manual focus adjustment while in AF Mode.
The EF 1635mm f/2.8L III USM offers complete manual control, even when AF is engaged, with a simple twist of the lens’s focus ring. Additionally, full-time manual focus means it’s easy to achieve and maintain focus manually, which
can be especially handy when shooting video or composing still images on an SLR’s screen.
Fluorine coating on front and rear lens surfaces helps reduce smears and fingerprints.
To help maintain a clean lens, even after multiple lens changes in sub-optimal conditions, the EF 1635mm f/2.8L III USM has a specially designed non-stick fluorine coating on its front and rear surfaces. This fluorine coating helps prevent
dust, water, oil and other surface residue like fingerprints from sticking to the lens, resulting in quick and easy wiping, without the use of solvents.