Canon EF Lenses

Canon EF 20-35mm f/3.5-4.5 USM Zoom Lens

The Canon EF 20-35mm f/3.5-4.5 USM is superior performance ultra-wide-angle zoom lens, covering the entire range of popular wide-angle focal lengths. A ring-type USM and an inner focus design provide fast and silent AF, along with full-time manual focus override. Priced within the range of serious photo enthusiasts, it's a great all-around choice.

Canon EF 20-35mm f/3.5-4.5 USM

Features and Specs | Large Image

Key Features of the Canon EF 20-35mm f/3.5-4.5 USM Zoom Lens

Ultrasonic Motor: Powered by Canon's exclusive Ultrasonic (USM) motor for autofocusing, the EF 20-35mm f-2.8L USM is silent in operation and very quick to focus, even in low-light conditions. There is virtually no whining noise as the lens focuses to distract the subject or draw attention to the photographer. Most important for the photographer in the field, the motor draws minimal power so the camera batteries last longer.

EF Lens Mount: In designing the EF lens mount, Canon engineers gave photographers a lot more than simply a way to quickly attach an interchangeable lens to a camera body. With the elimination of mechanical connections and the incorporation of an electronic interface between the camera and lens, Canon cameras have greater flexibility with regard to incorporating future technologies and future system upgrades. This fact has already been proven with a vast increase in AF speed, increased functionality such as predictive autofocus systems found in EOS cameras, auto-aperture tilt-shift (TS-E) lenses, the use of ultrasonic motors and the development of the Image Stabilizer lens.
The fully electronic mount system has none of the shock, operational noise, abrasion, play, lubrication requirements, slow response, diminished precision caused by lever operation, or design restrictions related to linkage mechanisms used to transfer data. Furthermore, operation and reliability are significantly improved. And, a lens operation self-test system, using the lens' built-in microcomputer, can even warn of malfunctions through the camera's LCD readout to help ensure high reliability.
Full-Time Manual Focus: Ring-type Ultrasonic Motor allows manual focusing without switching out of the auto mode, making this lens ideal for many photographic applications including sports, photojournalism, portraits, and landscapes.
Inner Focusing and Rear Focusing: An inner focusing lens has the focusing lens group(s) in front of the diaphragm, while a rear focusing lens has the focusing lens group(s) behind the diaphragm. Both focusing systems allow the focusing lens group to be small. This minimizes the load on the actuator which drives the autofocus. In turn, the AF speed is faster. The whole optical system can also be made more compact. Also, since the lens does not rotate during focusing, the effects of a circular polarizing filter or gelatin filter remain intact.

Specifications

Focal Length: 20-35mm
Lens Construction: 12 elements in 11 groups
Maximum Magnification: 0.13x (at 35mm)
Maximum Aperture: 1:3.5-4.5
Minimum Aperture: 22-27
Diagonal Angle of View: 94º - 63º
Focus Adjustment: Inner focusing system with USM
Closest Focusing Distance: 0.34m / 1.1 ft.
Zoom System: Rotating type
Filter Size: 77mm
Max. Diameter x Length: 3.3" x 2.7" / 83.5 x 68.9mm
Weight: 12 oz. / 340g

Canon EF Lenses
Overview | Technology | Lenses