Canon 17-40mm f4.0L USM is an Auto Focus (AF)
Ultra-Wideangle Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Canon EF mount cameras.
Canon 17-40mm f4.0L USM is a member of Canon's EF L series of lenses. Below you can see the latest lenses in this series.
EF L Series Lenses in Canon EF Mount
Lens Mount
Canon 17-40mm f4.0L USM is compatible with cameras that have Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Focal Range
Canon 17-40mm f4.0L USM has a focal range of 17-40mm and 2.4X zoom ratio. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 27.2 - 64mm.
Weather Sealings
Canon 17-40mm f4.0L USM is a weather sealed lens which provides an extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have an effective protection, you have to pair the Canon 17-40mm f4.0L USM with a weather sealed camera body such as Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Optical Image Stabilization
Canon 17-40mm f4.0L USM doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Alternatively, you can check the Canon 16-35mm f4L IS USM in Canon EF mount that have similar focal range but features Optical Image Stabilization.
Lenses Similar to Canon 17-40mm f4.0L USM With Optical Image Stabilization
Zoom Method
Canon 17-40mm f4.0L USM features Rotary (internal) zoom method where the length of the lens doesn't change while you are zooming in or out. Even though this design has a size disadvantage in general compare to extending designs, it has the benefits of better sealing against dust and moisture, no zoom creep and no weight balance shift while zooming.
Maximum Magnification Ratio
Canon 17-40mm f4.0L USM has a Max Magnification Ratio of 0.24x and has a minimum focusing distance of 0.28m.
Aperture
Canon 17-40mm f4.0L USM is a fixed aperture lens with a constant max aperture of f4 from 17mm all the way to the 40mm .
Optical Formula
Canon 17-40mm f4.0L USM's optical formula consists of 12 elements in 9 groups . Special elements used in this design is Super Spectra coatings.
Lens Hood
Canon 17-40mm f4.0L USM doesn't come with a lens hood but there is an optional lens hood with a part code of EW-83E that you can order separately.
Body Colour
Canon 17-40mm f4.0L USM is available in Black color.
Popular Comparisons of Canon 17-40mm f4.0L USM
Here is the eight most popular comparisons of Canon 17-40mm f4.0L USM amongst Camera Decision readers.