Canon EF 17-40mm lens

Infobox photographic lenses
name = EF 17-40mm f/4L USM

---

maker = Canon
feat-is = n
feat-usm = y
feat-sbf = n
feat-macro = n
feat-special =
type = z
application = Ultra-Wide Zoom
flength = 17-40mm
fov = 1.0
aperture = f/4 - f/22
groups = 9
elements = 12
diaphragm = 7
close-dist = 11in / 280mm
max-mag = 0.24 (at 40mm)
weight = 1.1lbs / 475g
max-diameter = 3.3in / 83.5mm
max-length = 3.8in / 96.8mm
filter = 77mm
hood = EW-83E
case = LP1319
av-horiz = 84° – 34°
av-vert = 53° – 19°30'
av-diag = 74° – 29°
start = 2003
msrp = $850
category = Canon EF lenses

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.

Audience

The 17-40 is the midrange of Canon's wide angle zoom range, between the superior but more expensive EF 16-35mm f/2.8L USM and the inferior but considerably cheaper EF 20-35mm f/3.5-4.5 USM.

While a member of the L-series, which as a group are primarily aimed at professionals, the 17-40 is itself primarily aimed at advanced amateurs who want a high-quality lens but are unwilling or unable to pay for the 16-35 lens, which costs approximately twice as much as 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 who wish to remain with a wide angle lens. On a cropped sensor, it has 35 mm equivalent focal length of 27-64mm, which covers wide-angle but not telephoto range. In this role it is compared with the EF-S 17-55.

Companion lenses

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).

=

ee also

*Canon EF 16-35mm lens

External links

* [http://www.usa.canon.com/consumer/controller?act=ModelDetailAct&fcategoryid=148&modelid=8940 Canon EF 17-40mm f/4L USM]