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

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Pictures

Canon EF 17-40 mm f/ 4 L USM lens

Canon EF 17-40 mm f/ 4 L USM lens

Canon EF 17-40 mm f/ 4 L USM lens

MTF-charts

Canon EF 17-40 mm f/ 4 L USM MTF Chart

Canon EF 17-40 mm f/ 4 L USM MTF Chart

Canon EF 17-40 mm f/ 4 L USM MTF Chart

Canon EF 17-40 mm f/ 4 L USM MTF Chart

Canon EF 17-40 mm f/ 4 L USM MTF Chart

Optical design

Canon EF 17-40 mm f/ 4 L USM optical design

Format: 35mm SLR

Type: Zoom lens

Focusing: Auto Focus (AF)

Lens mounts: Canon EF, EF-S

First year of production: 2003

Optical design: 12 elements in 9 groups

Features: Ultra-Sonic Motor
User reviews (3)

Photos (11)

Tests (0)

Owners (29)

Views (13959)

Average price: $770

Specifications:

Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
17mm - 40mmf/4.0f/2270.2877500/17,696.8/3,8

Additional information:

The Canon EF 17-40 mm f/ 4 L USM is a professional wide-angle lens for film and digital Canon EOS cameras.

The device is well assembled, without backlashes. It is dust and moisture resistant.

On APS-C sensors the focal length range is equivalent to 28-70 mm.

In order to minimize spherical aberration,  three aspherical elements of two different types  are used in the optical system of the Canon EF 17-40mm f/4.0 L USM (although there is a slight distortion), while an ultra-low dispersion lens prevents chromatic aberrations.

In addition, a special Super Spectra lens coating minimizes the intensity of  ghosting and flare caused by internal reflections.

Thanks to a circular aperture, the electromagnetic diaphragm (EMD)  smooths tonal transitions and makes an out-of-focus image look more natural. The additional aperture reduces the possibility of flare and improves overall image contrast.

The Canon EF 17-40 mm f/4L USM  is perfectly fit for shooting landscapes and architecture. It can be limitedly used for shooting genre scenes (lens speed may be insufficient).

Compatible hood: EW-83E

A hood and a soft case are included in the delivery set.


Links to online resources:
PDF Files:
Posted by: Sergei Borodin   Date of publication: 27.07.2010



Photos taken with this lens Canon EF 17-40 mm f/ 4 L USM:


Winter
Autor: Sergei Borodin
4.25 0 3747

***
Autor: Sergei Borodin
4 0 4886

Business Center Moscow City
Autor: Oleg Smagin
3.67 0 2721

The long and winding road
Autor: Ko Jonus
3.25 0 910

Mechanical quality4.7311
Optical quality4.0912
Usability4.6411
Pricing / Value3.6411
Bokeh3.3312
Overall lens rating
4.09

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Owner reviews: Canon EF 17-40 mm f/ 4 L USM

Period of use: 3 years

Strengths:

It L-lens is relatively inexpensive. A good range of focal length on the FF. Good hood with a nap in complete. Good sharpness in the center.

Weaknesses:

Разрешение падает по краям. Есть дисторсия. Не показался слишком быстрым при фокусировке.


Comments:

A good lens for landscape / interior. For a street photo - too weak aperture ratio



Сергей Бородин 1.1.2000 00:00:01
Period of use: 2 years

Strengths:

A very good constructive, fast and accurate autofocus. Dust and water protection

Weaknesses:

Not too fast focusing in the dark. In the genre of reportage photography, and often a lack of Aperture ratio. Distortion still quite visible

Comments:

Very good lens especially if used on a film or Full Frame sensor. Overall a positive experience. Sold after buying the Sigma 20 1.8 and Sigma 12-24