Description
The 17-40mm f/4 is one of Canon's best deals in
L-series glass. You have to spend twice as much to get a lens of
similar quality, but just one stop faster. Does this make the
more-expensive EF 16-35 f/2.8L a ripoff? Not for its own specific
use: the extra stop gives you the speed to shoot in more indoor
situations and not all photographers need this.
If you frequently find yourself
zooming out to get everything in a frame, you will want
this Canon 17-40mm wide angle lens. If you frequently find yourself zooming in, this is not the
lens for you. On a full frame body such as Canon EOS 5D, this lens becomes
ultra wide angle. On an
APS-C crop body such as Digital Rebel XTi, it becomes
medium wide angle. But thanks to 1.6x crop factor, this lens expands to more usable
35mm equivalent focal length of 27 to 64mm.
This is an affordable L-series ultra-wide-angle zoom lens that's ideal for both
film SLR and
digital SLRs.
Like all L
series lenses, this one is built extremely solid. It may feel fairly large and bulky to those who haven't used L series lenses before. The extra bulk is
comes from higher quality glass and the use of more durable materials (metal vs. plastic).
Superior optics are assured by the use of three
aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant
f/4 maximum aperture, and offers the choice of screw-in 77mm
filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses
Features
The
Canon EF 17-40mm f/4L
USM
is a new and affordable
L-series ultra-wide-angle
zoom lens that's ideal for both
film and
digital SLRs. Superior optics are assured by the use of three aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element.
Optical coatings are optimized for use with
digital SLR cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time
manual focus and a powerful ring-type USM for fast and silent
AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.
Optimized for Digital Imaging
High Speed Rear Focusing
Close Focusing to 11 inches
Non Rotating Front Element
Rear Gel Filter Holder
Shorter and about 35% lighter than 16-35 f/2.8 L-Series Lens
