Product Description

The super-wide angle's useful range of view can be conveniently utilized by simply rotating the smooth zoom ring.SLD (Special Low Dispersion) Glass is used for effective compensation of color aberration. Two pieces of molded glass aspherical lens elements offer excellent correction for distortion as well as all types of aberration. It is an ideal lens for Digital SLR Cameras as well as film SLR cameras.HSM (Hyper Sonic Motor) provides quiet, high-speed autofocus shooting, as well as full-time manual focus. It is easy to revert to Manual Focus by simply turning the focusing ring and overriding the AF.An inner focus system provides high performance and convenience. The non-rotating lens barrel perfectly suits the matched petal shaped lens hood.

Product Details

• Brand: Sigma
• Model: 510-101
• Dimensions: 5.20" h x 5.50" w x 5.70" l, 1.23 pounds

Features

• Sigma EX lens with 17-35mm zoom
• Incorporates aspherical lens elements in the front, as well as rear lens groups
• Equipped with a silent, responsive and fast Micro Hyper Sonic Motor (HSM)
• Incorporates internal focusing to prevent deterioration of the optical quality at close distances
• Use with Canon SLRs that are compatible with AF lenses

From the Manufacturer
Sigma's 17-35mm f2.8-4 EX combines a fast f2.8-4 maximum aperture with ultra wide angle zoom lens of 17-35mm. It incorporates aspherical lens elements in the front, as well as rear lens groups, to correct spherical aberration. It also incorporates internal focusing to prevent deterioration of the optical quality at close distances and to eliminate rotation of the front barrel during focusing. A "perfect hood" is provided. The AF drive for Sigma SA and Canon AF SLR cameras is equipped with a silent, responsive and fast Micro Hyper Sonic Motor (H.S.M.). The lens materials used in this new lens are lead and arsenic free ecological glass.

Customer Reviews

Great third party glass, as good as the canon L version.
I debated for a while wether to spend the money on the Canon L series 16-35mm, 17-40mm, or this lens. The 17-40mm was almost triple the price and the 16-35mm is 10x the price. So I went to the store and held each one and took some test shots on a tripod at the same settings and outside the store onthe side of the road in Atlanta, GA. The cityscape made a very nice test subject. Okay, to compare the three and explain my decision let me start out with build quality. The Canons feel like they belong on a tank, solid gigantic hunks of metal, very sturdy. But after using them for a little while the weight does wear on you. They don't just look heavy, they are heavy. The sigma is much lighter and a little shorter. The construction is very nice with a beautiful black surface finish. It looks and feels like it will be very rugged. I wouldn't want to drop any of the three on the pavement but I do think the canons would probably survive the experience. But I baby all my gear so I wasn't so worried about the possibility of a drop. But If I had to haul the canons in a pack all day or on the camera I would get very tired, I do alot of walking/exploring shooting and I use the 5D which is already heavy enough with the battery grip and flash attached. So the sigma won out for usability and portability. Now here comes the big surprise, when I got home and looked at the pictures side by side the Sigma was sharper across the board than the 17-40mm and on par with the 16-35mm. The color depth was a tiny bit better from the 17-40mm versus the other two but I could easily get the other two to that point with a quick fix in photoshop.Some people might say well the sigma is a veriable f2.8-f4 aperture lens where the 17-40mm is a fixed f4 and the 16-35mm is a f2.8 fixed and i say to them that I mainly use the 17-35mm range for landscapes and you never use your lens at f2.8 on landscapes nothing will be in focus. I regularlr stop my lens down to the F16-F22 all the time. So I would never need a fixed aperture. plus at 17mm at F4 you can still hand hold at 1/20th of a second and at say iso 800 that is plenty enough to take band pics in a deemly lit bar with some very interesting and pleasing effects. So I would say if you are going to be shooting in a war zone or the Sahara get the canon 16-35mm it really is the best pro ultra wide there is, but if you want the quality of the canon for a 10th the price and you aren't in a extreme environment get the sigma, it is a diamond in the rough and an asset to my camera bag. I would also recommend getting a good UV protective filter for the front of the lens. Any little speck or scratch on the front optic is very visible because of the wide angle.

You get what you pay for
This lens in just ok. It is a little soft at the edges and at wide apertures. After using it for a few months I sold it to buy a Canon 17-40 f/4 L. The Canon is a stop slower and a couple hundred dollars more, but the images are sharper and it is weather sealed. I would invest the extra money in a Canon lens.

One of the best Sigma lenses
Quite a sharp lens, did some very good shots until I replaced it with Canon 16-35 f/2.8. Overall I was very happy with it, the tiny little problem it is a very fragile lens (like most of Sigma lenses), and it needs a very special treatment, also the size of the filter is very big, makes it very expensive to buy 82mm C-PL for example.