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

BH #CA17404LEF • MFR #8806A002
Canon EF 17-40mm f/4L USM Lens
Key Features
  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/4 to f/22
  • One Super Ultra-Low Dispersion Element
  • Three Aspherical Element
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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.
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Canon EF 17-40mm f/4L USM Overview

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/4L USM Specs

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
Packaging Info
Package Weight1.7 lb
Box Dimensions (LxWxH)7.1 x 5.4 x 5.4"
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Is this lens internal focus and zoom or external ...

Is this lens internal focus and zoom or external focus/zoom? (i.e. does it get longer when focusing or zooming?)
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Yes this lens has internal focusing and zoom.
Answered by: Kirk
Date published: 2021-01-25

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I have the cropped sensor canon 77d, and Im not sure which L series lens to choose from for landscape photography? planning on using it at Yosemite and more.
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The Canon EF 17-40mm f/4L USM Lens listed above is not much wider than the Canon EF-S 18-55mm f/4-5.6 IS STM Lens or the Canon EF-S 18-135mm f/3.5-5.6 IS USM Lens originally included as kit lenses with the purchase of the Canon EOS 77D DSLR Camera. If you are specifically looking for an L-series lens for landscape photography and need the lens wider than your current lens, I would recommend the Canon EF 11-24mm f/4L USM Lens B&H # CA11244LUSM, for your usage needs. If you need a more economically-priced lens option, while it is not a Canon L-series lens, the Sigma 12-24mm f/4 DG HSM Art Lens for Canon EF, B&H # SI12244C, would also be a good full-frame lens option compatible for use on the Canon EOS 77D DSLR camera.
Answered by: Manzell
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Does it have IS? Want to find good lens for BMPCC

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Is using this lens with a speedbooster on an ...

Is using this lens with a speedbooster on an APS-C camera will effectively convert the focal length to 12-28mm with an aperture of one stop faster?
Asked by: keino
The Speedbooster is x0.7 to be used with a native S35mm/APS-C sensor camera. I fancy the idea of this lens becoming wider as well as a shorter telephoto range.
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Spot on! I have the same setup and it works perfectly! I normally shoot it near the 40mm range, but if I need to, the 17mm comes in handy when I have a large team photo to shoot and not enough room to work with.
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Will it work on a Canon EOS Rebel T6???
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I bought this lens for use with my 7D Mark II, and it ultimately gave the same results as my kit 18-55mm (which I got in the Rebel T6 bundle). If you already have that kit lens, and intend the lens for use with an APS-C sensored camera, I would wait to upgrade until you move over to full frame. I returned mine, even though I got it on a good sale.
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