Canon Home > Zoom Lenses > Go to My Shopping Basket
Canon EF 17-40mm F4.0 L USM


£639.00

The EF17-40mm f/4L USM is an ultra wide angle Canon EF zoom lens meant for professional and high amateur SLR EOS camera users.

While it is an excellent lens when used with an analogue SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens.

The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity.

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

The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm. You can override AF mode with manual focus should you wish.

Controlled by an electromagnetic diaphragm, the EF17-40mm f/4L USM’s circular aperture can achieve a more attractive appearance to out of focus background areas in a picture.

The front of the lens does not rotate as you focus. This means, for example, that polarising filters still function effectively as you zoom in and out. At the rear of the lens there’s a drop-in gelatin filter holder.

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.

 
Canon Related Accessories
http://www.jacobsdigital.co.uk/images/products/thumbs/00019501-00019750/19688.jpg Canon EF25 Extension Tube
£159.99
Add to basket 
http://www.jacobsdigital.co.uk/images/products/thumbs/00043001-00043250/43208.jpg Canon EF12 II Extension Tube
£79.99
Add to basket 
http://www.jacobsdigital.co.uk/images/products/thumbs/00114001-00114250/114057.jpg Canon EW-83E Lens Hood
£39.99
Add to basket 


Technical Specs.

Lens TypeWide Angle Zoom
Lens FittingCanon EOS
Focal length17-40mm
35mm Equivalent28-70mm
Angle of View93deg - 49deg 20, 70deg 30 - 34deg, 104deg - 57deg 30
Lens construction12 elements in 9 groups
Diaphragm Blades7
Min. aperturef22
Min. focusing Distance0.28
Max. magnification0.24 (at 35mm)
AF ActuatorUSM
Filter Diameter77mm
Max. Diameter x Length83.5 x 96.8mm
Weight500g
Lens HoodEW-83E
Soft CaseLP1319