Like Every L series Lens,
this Lens is Extremely Solid
One of the best Canon values in an L-series lens, the Canon 17-40mm f/4. You'll need to spend more than twice as much money to get a similar quality lens, but a stop quicker. Is the more-costly Canon EF 16-35 f/2.8L then a ripoff? Well, not on its own particular use: the extra aperture stop delivers the additional speed to photograph in more indoor environments and not every photographer need this.
If you often zoom out to include everything in your frame, you'll want to get this wide-angle Canon 17-40mm lens. If you often zoom in, then you should look at another lens. Mounted to a full frame camera like the Canon EOS 6D, the lens is ultra wide angle. Mounted to an APS-C sensor camera like the Digital Rebel T4i, it acts like medium wide angle lens. With thanks to the 1.6x crop factor, the lens becomes a more usable 27 to 64mm equivalent 35mm focal length. An affordable ultra-wide L-series zoom that's just right for both both DSLR and Fillm SLR cameras.
Built like every L series lens, this lens is extremely solid. It may feel large and bulky for those of you who have not shot with an L series lens before. This additional bulk is caused by higher glass quality and the inclusion of more durable construction materials (i.e. metal vs. plastic).
Superior optics are guaranteed by the inclusion of
triple aspherical lens elements. Additionally, there's a a Super UD glass element (Ultra-low Dispersion). Optical coatings have been optimized for
use on digital cameras. This lens focuses down as near as 11 inches, and offers both the Canon all-time manual focus along with a robust ring-style USM for quick, silent autofocus. It features a perpetual f/4 aperture opening, and lets the photographer choose between screw-type 77mm filters or rear lens holder for as many as three gel filters. Additionally, it offers weather-resistance similar to all higher-end L-series Canon 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
• LP1319 Lens Pouch Case
• EW-83-E lens Hood.