Canon EF 17-40mm F4 L USM Lens

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The Canon 17-40mm f/4 USM is an affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. This EF lens focuses as close as 0.28m. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to 3 gel filters. The 17-40mm f4L also features a wear-resistant construction.

Key Features: Canon EF 17-40mm f/4 L USM Lens

    Superb optical performance throughout the zoom range
    Fast autofocus speed
    Highly resistant to dust and moisture
    28cm minimum focusing distance at all focal lengths

Ultra-wide or standard zoom
The EF 17-40mm f/4L USM acts as an ultra-wide angle zoom on film or full-frame digital EOS cameras. On DSLRs equipped with APS-C sized sensors it acts as a standard zoom, giving an angle of view equivalent to a 28-70mm lens on a full-frame camera.

Close focusing
Minimum focusing distance is just 28cm throughout the entire zoom range.

Superior optical performance
The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses 3 aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations.

Ultrasonic focusing
A ring-type ultrasonic motor drives autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode.

Non-rotating front element
The front of the lens does not rotate, which makes using specialised filters, such as polarisers and graduates, easier. A drop-in gelatine-filter holder can be found at the back of the lens.

Smooth background blur
A virtually circular aperture diaphragm gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background.

Weather resistant
Highly resistant to moisture and dust, the EF17-40mm f/4L USM is ideally suited for use in harsh environments. Environment friendly lead-free glass is used throughout its construction.


Aperture Blades     7
Autofocus Motor     USM
Colour     Black
Enlargement Ratio     1:4.2
Filter Thread Size (mm)     77
Focal Length – Tele (mm)     40
Focal Length – Wide (mm)     17
Hood Model     EW-83E
Included Accessories     Lens pouch, Front and rear caps, Lens hood
Lens Mount     Canon EF
Lens Type     Standard Zoom
Manual Focus Switching     Full Time Manual Override
Maximum Aperture – Tele     4
Maximum Aperture – Wide     4
Minimum Aperture     22
Number of Lens Elements     12
Number of Lens Groups     9
Sensor Format     Full Frame
Size (mm)     83.5 x 96.8 mm
Weight (g)     500
MF switch     Full Time Manual Override
Minimum Focus Distance (m)     0.3

More Information
PreOrder No
Free Shipping Available Yes
Colour Black
Sensor Format Full Frame
Lens Mount Canon EF
Lens Type Wide Angle
Prime/Zoom Zoom
Maximum Aperture (Wide) 4
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