Canon EF 17-40mm f/4L USM

Affordable, light and portable, with L-series quality.




Small and lightweight for its class, the EF 17-40mm f/4L USM combines outstanding L-series build quality with an affordable price tag. Its size makes it easy to carry and comfortable to use, while its versatility and superior optical performance makes it a great general purpose lens. As a landscape lens, the EF 17-40mm f/4L USM features a ring-type ultrasonic motor for superfast, accurate autofocus in near silence, as well as wide open centre and corner sharpness for finely detailed images. Its seven-blade circular aperture delivers excellent OOF (Out of Focus) blur quality, while the lens itself offers superb full frame compatibility and performance. This is a great choice if you are interested in landscape photography or real estate and architecture photography, and is especially handy if you need to work in a tight space!

Canon EF 17-40mm f/4L USM

CANON EF 17-40MM f/4L USM

About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It’s ideal for both film and digital SLRs, and features the same weatherresistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens.

Ultra Wide Lens for Analogue EOS SLR Cameras

Ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users.

Standard Zoom Lens for Digital EOS SLR Cameras

Suited for SLR cameras with an imaging sensor size smaller than the 35mm format, This can give an angle of view equivalent to that of a 28-70mm lens.

Superior Optical Performance

Super Spectra Coating on the elements ensures colour balance and minimises ghosting and flare to provide image quality over a 17-40mm zoom range.

Extensive Set of High-End Features

The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm.

Ultra Wide Lens for Analogue EOS SLR Cameras

Ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users.

Standard Zoom Lens for Digital EOS SLR Cameras

This can give an angle of view equivalent to that of a 28-70mm lens.

Superior Optical Performance

Super Spectra Coating on the elements ensures colour balance, minimises ghosting & flare to provide image quality.

Extensive Set of High-End Features

The AF works silently and quickly thanks to a fast central processing unit.

Selected shots from the EF 17-40mm f/4L USM

    Detailed Specifications

    Focal Length & Max. Aperture
    17-40mm 1:4
    Filter Diameter
    77mm
    Magnification with Extension Tube EF12
    0.83x – 0.32x
    Magnification with Extension Tube EF25
    1.02x – 0.70x
    Diagonal Angle of View
    104° - 57° (43.2mm)
    Horizontal Angle of View
    93° - 49° (36mm)
    Lens construction
    12 elements in 9 groups
    Minimum aperture
    f/22
    No. of aperture blades
    7 (circular aperture)
    Closest focusing distance (m)
    0.28m
    Focus drive
    Ultrasonic
    Dimensions
    83.5mm dia. x 96.8mm
    Weight
    475g
    *All data based on Canon’s Standard Test Method
    *Subject to change without notice