Editorial Review:Product Description: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 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.
Amazon.com Product Description:Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty.
- Focal length: 17-40mm
- Maximum aperture: 1:4
- Lens construction: 12 elements in 9 groups
- Diagonal angle of view: 104 to 57 degrees (at 30 feet)
- Focus adjustment: Inner focusing system with USM
- Closest focusing distance: 0.9 feet
- Zoom system: Rotating type
- Filter size: 77mm
- Dimensions: 3.3 inches in diameter, 3.8 inches long
- Weight: 1.1 pounds
Accessories:
see more
Accessories:
Availability: Usually ships in 24 hours
Related Items:
see more
Related Items:
Customer Reviews
Average Rating:

Rating: 
-
Great wide angle range.
I got this lens for my full-frame camera (5D), and it's a great lens to get into wide angle photography - sharp and versatile, plus it's very nicely priced for an L lens. Be aware that the crop factor of APS sensor cameras makes this lens more of a 27-64mm. If you have one of these cameras and you really want to have ultra wide-angle capability, you might be better off with something like Canon's EF-S 10-22mm.
Rating: 
-
makes you better
photography is my hobby. i do enjoy it and wanted to improve. i bought this lens to give more range to my lens. i have, the kit lens for my 30D and a 70-200 f2.8L. the telephoto was just too heavy for everyday/walk around use. the 17-40 fits the bill. i have shot about 2000 pictures. i would say about 20% are keepers (because i am learning). focusing at such a wide perspective (i got the hang of it about 250-500 shots) does take some getting used to. the lens does teach you a lot about f stops, lighting, and composition when in full manual. overall, the quality of the lens is outstanding. sunsets and "vista in the southwest" are when i appreciate this lens. i was most surprised at how good it works in close quarters. for example, my kids walking around the mall. it is expensive, but the EF 16-35 f2.8L, was simply out of my range. it is better than the kit lens for sure. i would agree with the majority of the positive reviews. the only drawback is the price, but i feel it is well worth it. AMAZON did not get the product to me as quickly as promised, but they did wave the shipping when i pointed it out.
in summary, if you are wanting to improve your skills in photography, then this lens is a great addition. it will not take better pictures, it will make you a more refined photographer/artist. as with all things worthwhile, it will cost you something.
Rating: 
-
Great lens for many different types of shots
This lens offers a fast lens with just the right amount of wide-angle. I've been using it for landscaping shots, up close, action, low light and its really impressed me. I would recommend this lens to anyone who wants to take their photography to the next level.
Rating: 
-
Amazing
This lens is amazingly sharp and well-built. As a wedding photographer, I would highly recommend it. It is gorgeously wide, especially on a full-frame body like the 5D. Buy this lens!
Rating: 
-
fantastic lens
Even 2 years ago the 17-40 L Canon lens was reserved for professional photographers because of its high price. Now it became available also for amatours. It's an amazing lens. Any picture taken with it its just fantastic. The colors, the sharpness, the quality its just beyond other lenses. "L" form canon holds its quality. I highly reccomend this lens for all photographers for whom taking pictures is more than just a hobby. IT'S DEFINITELY WORTH ITS PRICE!!!