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Canon EF 17-40mm f/4.0L USM

Canon EF 17-40mm f/4.0L USM lens
Canon EF 17-40mm f/4.0L USM lensCanon EF 17-40mm f/4.0L USM lensCanon EF 17-40mm f/4.0L USM lens
 

Full frame sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

One or more Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

 

Metal mount

Cheaper lenses are usually equipped with plastic mount, while more expensive, professional lenses have metal mount. In general, metal mounts are more durable, and a good thing to have when lenses are changed a lot. When a camera is used mainly with one lens, the material of the lens mount is not that important.

 

Internal Focusing

Internally focusing lenses don't change their size while setting focus.

 

The front lens is fixed

The fixed front lens is not rotating during zoom and/or focusing. This allows the photographer to use petal shaped lens hood. Fixed front lenses also make the use of polarization filters a lot easier.

 

Weather Sealed

Weather sealed lenses are protected from dust and water. While they are not water proof, these lenses can be used in rain and other humid environments. Some sealings only provide protection against dust or water, not both. Sealing is only available when the lens is used on a similarly weather sealed camera body.

 

Supports drop-in filters

Drop-in filters are used in those lenses where either the front lens is too large, or the field of view doesn't permit the use of traditional filters at the front of the lens. Usually bright tele and ultra-wide angle lenses support this filter type.
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. 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. 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 EF 17-40mm f/4.0L USM Specification

Available mount(s) Canon EF
Application(s) Landscape, Interiors, Architecture
Category(s) Wide angle zoom
Multiplier 1×
Stabilizer no
Focal length 17 - 40 mm (2.4× zoom)
Lens construction 12 elements in 9 groups
Angle of view 35mm: 104-57.5°
digital: N/A
Number of blades 7
Maximum aperture wide: f/4 tele: f/4
Minimum aperture wide: f/22 tele: N/A
Minimum focusing distance 28 cm
Magnification 0.24×
Filter size 77 mm
Size ∅ 83.5 × 96.8 mm
Weight 500 g
Notes Mechanical full-time manual focusing built-in. Magnification: 0,24 at 35 mm
AF speed N/A
AF sound
Internal focusing yes
Internal zoom N/A
Fix front lens yes
Mount type metal
Weather sealed yes
Drop in filter yes
Ultrasonic AF yes
Stepping motor AF no
APS-C sized circle no
Low dispersion lens element yes
Hard case N/A
Soft case LP1319 (included)
Lens hood EW-83E (included)
printable lens hood
Tripod adapter N/A
Canon EF 17-40mm f/4.0L USM Specification

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