Canon EF 17–40mm lens

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EF 17–40mm f/4L USM
Canon EF 17-40mm f4L USM.jpg
Maker Canon
Key features
Ultrasonic motor Yes Yes
Short back focus No No
Image stabilization No No
Macro capable No No
Application Ultra-Wide Zoom
Technical data
Type Zoom
Focal length 17–40mm
Crop factor 1.0
Aperture (max/min) f/4–f/22
Construction 9 groups / 12 elements
# Diaphragm blades 7
Close focus distance 280mm / 11in
Max. magnification 0.24 (at 40mm)
Max. diameter 83.5mm / 3.3in
Max. length 96.8mm / 3.8in
Weight 475g / 1.1lbs
Filter diameter 77mm
Lens hood EW-83E
Case LP1319
Angle of view
Horizontal 93°–49°20'
Vertical 70°30'–34°
Diagonal 104°–57°30'
Introduced 2003
Retail info
MSRP US$ $800

The EF 17–40mm f/4L USM lens is a wide-angle lens made by Canon Inc. The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from f/4 to f/8.


The 17–40mm is the least expensive of Canon's wide angle zooms, with the EF 16–35mm f/2.8L USM and the EF 20–35mm f/2.8L being both faster and more expensive. Weighing 475 g and measuring 83.5 mm x 96.8 mm, it is a popular choice with many photographers because of its light and compact size.[1] A member of the L-series, the 17–40mm is a good substitute for the 16–35mm f/2.8 lens, which is heavier and costs approximately twice as much. However, it should be noted that Canon now sells an image-stabilized 16–35mm f/4 lens for about $300 more than the 17–40.

This lens is also a popular step up from the stock kit lens on many of Canon's EOS Digital family of cameras, the EF-S 18–55mm f/3.5–5.6, for those still wanting a wide angle lens. On a cropped sensor, it has 35 mm equivalent focal length of 27–64mm. In this role, it is compared with the EF-S 17–55mm lens.

Companion lenses[edit]

This lens is often paired with an L series telephoto lens, such as the EF 28–300mm f/3.5–5.6 L USM or any of the EF 70–200mm family (f/4L USM, f/4L IS USM, f/2.8L USM, f/2.8L IS USM).



External links[edit]