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Product Description

This super wide-angle zoom lens with a 104 degrees angle of view, and large aperture is ideal for Digital SLR Cameras. It has a minimum focusing distance of 27cm / 10.6in. at all focal lengths, and maximum magnification ratio of 1: 4.5. 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.

From the Manufacturer
Sigma's 17-35mm f2.8-4 EX is one of the EX Series lenses. It 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 lens materials used in this new lens are lead and arsenic free ecological glass.

Aspherical lenses
Lens elements that are not spherical can reduce the total number of elements required in a lens design. They can deliver better performance while reducing weight and size. Aspherical lenses maximize optical performance while minimizing lens size and weight. Aspherical lenses help reduce some of the problems usually associated with wide angles and zooms, such as lens flare and edge distortion. They also help deliver higher quality telephoto images.

Specifications:

• Lens Constructions: 14 groups, 15 elements
• Angle of View (Diagonal): 103.7º-63.4º
• Number of blade in diaphragm: 8
• Minimum Aperture: f32-45
• Minimum Focusing Distance: 19.7 inches
• Magnifications: 11.5x
• Filter Size: 82 millimeters
• Dimensions (Dia x Length): 3.5 by 3.3 inches
• Weight: 14.1 ounces

Customer Reviews

The Price and wide aperature is a steal
I wanted a lens with a large aperature and wide angle to take close ups and landscapes without much distortions. This lens met the cost and the aperature I needed. I have the Nikon D40 and D40X and the lens works great on both. Have taken superb photos that give me the feel of professional shooting withiout the cost. Goes well with my Nikon 18-55 f3.5 and Nikon 18-135 f3.5 lens and Nikon 70-300 F4.5 when I go out to shoot landscapes in all kinds of scenes. With the internal focus, I have not had any problems when shooting in auto focus mode. Recommend for users of the D40, D40X & D80 bodies.

good for its price
This lens is not a must have, although for its price it is fairly good.

Sigma 17-35 f2.8-4 EX DG IF HSM Aspherical Super Wide Angle Zoom Lens for Nikon SLR
Sigma 17-35mm f/2.8-4 EX DG IF HSM Aspherical Super Wide Angle Zoom Lens + Hoya 77mm UV Haze Protector Glass Filter + 6-Piece Cleaning Kit + Spudz Microfiber Cleaning Cloth - for Nikon Digital & Film Autofocus SLR Cameras including Nikon D40, D40x, D50, D70, D70s, D80, D100, D200 & D300Great lens for the money. Quick, accurate focus. Took hundreds of interior and exterior photos in tight places on a trip to Italy. Distortion is noticable at 17 mm. Sun flare can be an issue. Both are to be expected on this type lens. Getting very satisfactory interior shots of real estate listings at 18 to 20 mm. Some shadow when using built-in flash on D200. Removing the included hood improves this.