Canon EF 17 40mm f/4.0L USM Standard Lens

Product information

The Canon EF17-40mm USM is an ultra wide zoom lens designed for professional and high amateur SLR EOS users.

It is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. On such 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.

Super Spectra Coating on the elements ensures excellent colour balance and minimizes 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 Ultra-low Dispersion glass is used to prevent aberrations that can degrade the clarity.

The Auto-focus works silently and quickly thanks to a fast central processing unit and you can override AF mode with manual focus should you wish. Its circular aperture can also achieve a more attractive appearance to out of focus background areas in a picture.

Minimum focusing distance is just 28cm throughout the entire zoom range. It’s highly resistant to moisture and dust, and environment friendly lead-free glass is used throughout its construction.

Suitable for use with Canon Digital SLR cameras.

Autofocus Motor Information Built-In autofocus engine to supplement your camera
Yes- USM
Diaphragm Blades Information The amount of blades used to create the aperture
L97 x Dia.83.5mm
Eligible for International Delivery
Equivalent Focal Length Information Focal length when viewed through cameras with a cropped sensor
27-64mm (APS-C 1.6x crop factor)
Filter Thread (mm) Information Section inside the front that allows accessories like filters and hoods to be attached
Focal Length Information The distance from the sensor and the optical centre of the lens when focused to infinity
Image Stabilisation Information Irons out blur and shake, so your shots are super-sharp
Lens Elements Information Amount of glass pieces that make up the lens
Lens Groups Information Amount of compounds that make up the lens
Lens Mount Information Type of camera fitting
Canon EF
Maximum Aperture Information Measures the lens' light exposure and, thus, depth of field
Minimum Aperture Information Measures the lens' light exposure and, thus, depth of field
Minimum Focus Distance Information The closest you can get to your subject without losing focus
28cm (11.02")
Model name / number
Sensor Format
Full frame, Canon APS-C
Weight Information Unpackaged weight


  • Click & collect

    Click & collect from John Lewis and Waitrose shops Monday from 2pm
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  • Collect+

    Collect + from a local shop from Monday, postcode exclusions apply
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  • UK delivery

    Standard delivery within 5 working days
    Named or Saturday UK delivery
    Named day UK delivery pre-10.30am
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  • International delivery not available


We want you to be happy with your purchase. If you're not, depending on the type of product, you can make free returns in the UK via John Lewis shops, Royal Mail, Collect+, or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454. Find out more about returns.

You'll find returns information on your delivery note. Unless faulty, we'd like you to make your return within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.

Q & As

Rated 4.8 out of 5 by 5 reviewers.
Rated 5 out of 5 by An excellent wide angle lens This is a great wide angle lens & in my eyes represents better value than the 16-35 for a few reasons: 1- it's literally half the cost 2- it's a lot lighter 3- I don't have a need for f2.8 when shooting landscapes. I really like the images that it produces & the quality of the L glass speaks for itself. 19 March 2014
Rated 5 out of 5 by Great bit of kit I have had this lens for about 3 years and it is excellent. I use it mostly for landscape photography and it does a very good job. Optics are first class and I can get pin sharp photos everytime. Good build quality and feels very robust. I have used it in the cold, in the rain, in salt spray and it has never let me down - a real workhorse. It is the cheapest L lens but do not let that put you off ,it will do an excellent job. 16 February 2013
Rated 4 out of 5 by Canon 17-40mm len Just recently brought this wonderful lense to put on my 7D and it's amazing piece of kit the results are fantastic !!!!! 27 July 2012
Rated 5 out of 5 by A professional quality lens for all round use A lens designed for all Canon SLRs, it's a super wide angle zoom on full frame, and gives a field of view equivalent to a 28 - 70mm lens when used on a camera with a smaller digital sensor. So this lens could be a very high quality replacement for a 'kit' lens that came with the camera. As you'd expect, optical quality is very high and the build ensures good protection against dust and moisture. 08 July 2011
Rated 5 out of 5 by Brilliant lens Great lens from Canon, good price from John Lewis. Excellent delivery service. 07 July 2011
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