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

Lens Overview - Canon EF 17-40mm f/4

Spanning a versatile wide-angle range, the EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. One Super UD element is featured, along with three aspherical elements, which help to reduce both chromatic and spherical aberrations in order to realize high sharpness, clarity, and color accuracy. A Super Spectra coating has also been applied to suppress flare and ghosting for improved contrast in difficult lighting conditions. Complementing the imaging capabilities, this wide-angle zoom also features a ring-type USM and internal focusing mechanism to afford quick, quiet, and accurate autofocus performance, as well as full-time manual focus override. Additionally, this lens is weather-sealed for use in trying environmental conditions.

Wide-angle zoom is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides a 27.2-64mm equivalent focal length range.
Constant f/4 maximum aperture maintains consistent illumination throughout the zoom range.
One Super Ultra-Low Dispersion glass element noticeably reduces color fringing and chromatic aberrations for high clarity and color fidelity.
Three aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering.
Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.
A ring-type Ultrasonic Motor (USM), along with an internal focusing system, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override.
Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.
As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.
In addition to the front 77mm filter ring, this lens also has a rear filter holder for up to three cut gel filters.
UPC: 013803028058

Canon EF 17-40mm f/4 Latest Price



Focal Length17 to 40mm
Maximum Aperturef/4
Minimum Aperturef/22
Lens MountCanon EF
Format CompatibilityFull-Frame
Angle of View104° to 57° 30'
Minimum Focus Distance11.02" / 28 cm
Maximum Magnification0.24x
Optical Design12 Elements in 9 Groups
Diaphragm Blades7, Rounded
Focus TypeAutofocus
Image StabilizationNone
Filter Size77 mm (Front)
Gel Filter (Rear)
Dimensions (ø x L)3.29 x 3.81" / 83.57 x 96.77 mm
Weight1.1 lb / 500 g

Photos Example - Canon EF 17-40mm f/4

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Lens Technical

17-40mm f/4L USMPanasonic Lumix S 24-105mm F4 Macro O.I.S.Canon RF 24-240mm F4-6.3 IS USM
Name Canon EF 17-40mm f/4L USMPanasonic Lumix S 24-105mm F4 Macro O.I.S.Canon RF 24-240mm F4-6.3 IS USM
Max Aperture At Min Focal f/4f/4f/4
Year 200320192019
Mount Type Canon EFLeica LCanon RF
Lens Type Lens Superwide,lens Wide,lens MediumLens Wide,lens Medium,lens TelephotoLens Wide,lens Medium,lens Telephoto,lens Supertelephoto
Auto Focus NoNoNo
Price $780$1300
Lens Zoom ZoomZoomZoom
Lens Range 172424
Global 25.585
Effective Mega Pixel 17.9384
Distorsion 0.44278
Vignetting -1.56841
Tstop 4.44234
Ac 10.5209
Vignetting Ranking 10369
Tstop Ranking 8233
Ac Ranking 8228
Pixel Depth 50.6
Price Sensor 3900
Sensor Raw 51.16
Sensor Format Sensor Fullframe
Type SemiProDSLR
Zoom Factor 111
Weight 1lb1lb1lb
Macro NoNoNo
Launch Date May. 2003Feb. 2019Feb. 2019
Brand CanonPanasonicCanon


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