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

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EF 17-40mm f/4.0L USM
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8806A014
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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.
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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, Ultra-wide lens, 12/9, 17 - 40 mm, Canon EF

Long summary description Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black:
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.

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. Product colour: Black. Diameter: 8.35 cm, Filter size: 7.7 cm, Length: 96.8 mm

Lens system
Component for *
SLR
Lens type *
Ultra-wide lens
Lens structure (elements/groups) *
12/9
Focal length range
17 - 40 mm
Number of diaphragm blades
7
Closest focusing distance *
0.28 m
Maximum aperture number *
22
Lens mount interface *
Canon EF
Performance
AF actuator
USM
Maximum magnification
0.24x
Design
Product colour
Black
Weight & dimensions
Length
96.8 mm
Weight
500 g
Diameter *
8.35 cm
Filter size *
7.7 cm
Source Testseek summary Average rating
Reviews
Updated:
2011-08-14 05:29:39
Uk has collected 25 expert reviews for Canon EF 17-40mm f/4.0L USM SLR Ultra-wide lens Black and the average expert rating is 80 of 100. The average score reflects the expert community’s view on this product. Click below and use Uk to see all ratings, product awards and conclusions.
80%
Source Review comments Score
itreviews.com
Updated:
2013-12-15 01:34:43
The Canon EF 17-40mm f/4L USM ($839.99 direct) 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 end with a 2.4x zoom fact...
Bottom line 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%