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Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black

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The general trademark of a manufacturer by which the consumer knows its products. A manufacturer can have multiple brand names. Some manufacturers license their brand names to other producers.
Canon
Product name:
Product name is a brand's identification of a product, often a model name, but not totally unique as it can include some product variants. Product name is a key part of the Icecat product title on a product data-sheet.
EF 17-40mm f/4.0L USM
Article code :
The brand's unique identifier for a product. Multiple product codes can be mapped to one mother product code if the specifications are identical. We map away wrong codes or sometimes logistic variants.
8806A014
Category
The light-gathering device of a camera, typically containing a group of compound lenses. Lenses come in different lengths, with very long lens used for long-distance photography.
camera lenses
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created/standardized by Icecat: the data-sheet is created or standardized by an Icecat editor.
Included since: 06 Mar 2007
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Info modified on: 29 Mar 2017 12:17:38
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Long product name Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black :
The short editorial description of Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black

EF 17-40mm f/4.0L USM
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Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black

The official marketing text of Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black as supplied by the manufacturer
The EF17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1.

Ultra wide lens for analogue EOS SLR cameras
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.

Standard zoom lens for digital EOS SLR cameras
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.

Superior optical performance
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.

Extensive set of high-end features
Minimum focusing distance is just 28mm 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.
Short summary description Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black:
This short summary of the Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black data-sheet is auto-generated and uses the product title and the first six key specs.
Canon EF 17-40mm f/4.0L USM, SLR, 12/9, Ultra-wide lens, 11" (0.28 m), Canon EF, 0.669 - 1.57" (17 - 40 mm)
Long summary description Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black :

Canon EF 17-40mm f/4.0L USM. Component for: SLR, Lens structure (elements/groups): 12/9, Lens type: Ultra-wide lens. AF actuator: USM, Maximum magnification: 0.24x. Color of product: Black. Diameter: 3.29" (8.35 cm), Filter size: 3.03" (7.7 cm), Length: 3.81" (9.68 cm)

This is an auto-generated long summary of Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black based on the first three specs of the first five spec groups.

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Lens system
Component for *
What this product is used as a part of (component for).
SLR
Lens structure (elements/groups) *
The way in which a camera lens is constructed.
12/9
Lens type *
Category of lens e.g. tele, close-up, macro.
Ultra-wide lens
Focal length range (f-f)
Measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.For an optical system in air, the effective focal length (f and f′) gives the distance from the front and rear principal planes (H and H′) to the corresponding focal points (F and F′).
0,669 - 1,57" (17 - 40 mm)
Lens mount interface *
A lens mount is an interface — mechanical and often also electrical — between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the rangefinder camera, single lens reflex type or any movie camera of 16 mm or higher gauge.
Canon EF
Maximum aperture number *
22
Number of diaphragm blades
7
Closest focusing distance *
0.28 m
Performance
Maximum magnification
Magnfication means making things appear larger than they are e.g. 2x magnifaction means that something appears twice as big as it in reality. The maximum magnification is the greatest magnification possible for the device.
0.24x
AF actuator
USM
Design
Color of product
The colour e.g. red, blue, green, black, white.
Black
Weight & dimensions
Diameter *
Distance from one side of a body (circle or sphere) to the other side, measured by a straight line passing through the centre of the body.
3,29" (8,35 cm)
Filter size *
A filter is a screen, plate, or layer of a substance which absorbs light or other radiation or selectively absorbs some of its components e.g. a UV filter to reduce UV light. Filters come in various sizes.
3,03" (7,7 cm)
Length *
The measurement or extent of something from end to end.
3,81" (9,68 cm)
Weight *
Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
17,6 oz (500 g)
Source Testseek summary Average rating
Updated:
2011-08-14
Testseek has collected 21 expert reviews for Canon EF 17-40mm f/4.0L USM and the average expert rating is 79 of 100. The average score reflects the expert community’s view on this product. Click below and use Testseek to see all ratings, product awards and conclusions.
79%
Source Review comments Score
brighthub.com
Updated:
2011-08-14
This article reviews Canons EF 17-40mm f/4L USM wide angle zoom lens, covering its features, performance, image quality and the value for money aspects. Features and Specifications(Image from Canon Website)The Canon EF 17-40mm f/4L USM lens is known...
This article reviews Canons EF 17-40mm f/4L USM wide angle zoom lens, covering its features, performance, image quality and the value for money aspects. Features and Specifications(Image from Canon Website)The Canon EF 17-40mm f/4L USM lens is known...
100%
whatdigitalcamera.com
Updated:
2011-08-14
Canon is the only company to make digital cameras with 35mm sized sensors. This lens can still be used on the APS-C sensor-equipped cameras, such as the EOS 400D or 30D, but there is a shift in the angle of view – expressed as a 35mm eq...
89%
Slrgear.com
Updated:
2014-10-29
The Canon 17-40mm f/4 L is a high quality lens with a full-frame image circle that showed really exceptional performance on the EOS-20D we used to test it with. (The EOS-20D has a nominally APS-C size sensor, so corner sharpness and distortion will be bet...
88%
cameralabs.com
Updated:
2011-08-14
The Canon EF 17-40mm f/4.0L was announced back in February 2003 as a lightweight ultra wide-angle zoom and has since become a bit of a classic lens for owners of Canon EOS digital and film SLRs. Its ultra-wide focal range delivers spectacular coverage...
Extreme wide angle coverage, Well-corrected at wider focal lengths, Fast and quiet USM focusing motor, An exotic but affordable L lens...
Zoom range too limited for general purpose, Soft corners at 40mm focused at infinity, Unimpressive macro capabilities, Light fall-off at wide angle (but expected)...
Canon EF 17-40mm verdict The EF 17-40mm f/4.0L is one of the best lenses in Canon’s range. It brings you a taste of the truly exotic with ultra-wide coverage, while boasting ‘L’ quality all at a surprisingly affordable price. Sure it ain...
83%
cameralabs.com
Updated:
2011-08-14
The Canon EF 17-40mm f/4.0L was announced back in February 2003 as a lightweight ultra wide-angle zoom and has since become a bit of a classic lens for owners of Canon EOS digital and film SLRs. Its ultra-wide focal range delivers spectacular coverag...
Canon L build and optical quality, Fast and quiet USM focusing motor, Constant f4 aperture throughout range, Will also work on full-frame body...
Shorter zoom range than kit lens, No IS (although not particularly necessary), Overkill if not considering full-frame in future, Canon EF-S 17-85mm more flexible for most...
Canon EF 17-40mm verdict for cropped APS-C bodies The Canon EF 17-40mm may deliver spectacular ultra-wide angle coverage when fitted to a full-frame body like the EOS 5D, but offers a more normal, general-purpose range when mounted on cropped bodies l...
77%
ephotozine.com
Updated:
2011-08-14
Gary Wolstenholme takes a look at this popular lightweight ultra-wide angle zoom lens, which has a constant aperture of f/4, an Ultrasonic focusing motor and sealing against the elements. has been a popular choice due to its lightweight design, and low...
Superb performance in the centre throughout the range, Well built, Lightweight...
Sudden softness in the corners may disturb full-frame SLR users, Distortion difficult to correct entirely at 17mm, Falloff at 17mm...
It's hard to write a succinct round-up for this lens, as it really depends on the kind of photography you do and the type of camera you are using as to whether I'd recommend this lens. For example, if you shoot subjects which require sharp details righ...
70%
pcmag.com
Updated:
2013-07-31
The Canon EF 17-40mm f/4L USM ($839.99 direct)%displayPrice% at %seller% is an ultra-wide to normal zoom lens that is compatible with Canon EOS SLR cameras. When used on a full-frame body, the lens provides an extremely wide 17mm field of view on the wide...
Ultrawide field of view. Reasonable price tag. Good center sharpness.
Muddy edges and corners at 17mm. Some distortion. Noticeable color fringing...
The Canon EF 17-40mm f/4L USM lens is an inexpensive alternative to the 16-35mm f/2.8, but its edges are muddy at its widest angle...
60%
The-digital-picture.com
Updated:
2011-08-14
The Canon L Series Lenses is a high quality, moderately-priced ultra wide angle zoom lens. Although not as fast as the Canon EF 16-35mm f/2.8 L lens, the Canon EF 17-40mm f/4.0 L USM Lens is a comparable lens in terms of image quality. The biggest dif...
0%
ephotozine.com
Updated:
2011-08-14
Canon 17-40mm f/4 L USM reviewThis lens, which has become almost legendary amongst Canon users, has been around for a little while now. There are a number of new or updated contenders on the market in what has been a competitive sector. We look at how...
0%
photozone.de
Updated:
2011-08-14
The Canon EF 17-40mm f/4 USM L is one of the most popular L class lenses thanks to its relatively affordable price and its dual purpose scope - it can serve as a standard zoom lens on APS-C DSLRs and its an ultra-wide zoom lens with an attractive ran...
Its not exactly easy to design a flawless full format lens and the Canon EF 17-40mm f/4 USM L shows its part of the struggles here. The lens is not overly fast but it has a comparatively broad range for a lens in this class and it seems as if Canon h...
0%
photo.net
Updated:
2011-08-14
Canon makes two high-quality wide-angle zoom lenses for full-frame cameras, the 17-40/4L reviewed here and the Canon EF 16-35mm f/2.8L USM, $1249 (review). In the digital era, the 17-40 has been overlooked to some extent. It isnt wide enough to be dra...
It isnt lighter than the 16-35/2.8L. It isnt better quality than the 16-35/2.8L. It isnt dramatically wide on the small sensor cameras. However, if you want a high quality wide-angle zoom with a medium weight and a medium aperture, the 17-40/4L is a...
0%
Wlcastleman.com
Updated:
2011-08-14
Review of the Canon EF 17-40mm f/4L USM LensComparison with Canon EF 20mm f/2.8 and Sigma 20mm f/1.8 EX Canon EF 17-40mm f/4 LThis article reviews the full frame performance of the Canon EF 17-40mm f/4L lens. My intented use of the lens is for landscap...
0%
Kenrockwell.com
Updated:
2011-08-14
In a Nutshell: Read the rest of this review if you like, or stop here and know that I bought myself one of these after having it and a 16-35mm L on loan for a month. I prefer this 17-40mm to the twice-as-expensive and heavier 16-35L. Ill forgo the wi...
0%
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