Average Reviews:
(More customer reviews)This is the first non-Canon lens I've purchased and the Sigma 17-70/2.8-4.5 DC surprised the hell me with its fine performance. Zoom range, speed, resolution, low Chromatic Abberation, fast/sure autofocus speed and solid build quality make this lens stand head and shoulders above the typical cheap Canon kit lens such as the terrible Canon EF 18-55/4.5-5.6. Plus the Sigma has 1:2.3 macro capabilities with very sharp results...AMAZING! I've read more and more reviews all over the Internet on this Sigma lens that praise its qualities. This lens will compete with Canon lenses costing two and 3 times as much (EF 17-40, EF 18-50/2.8, EF 16-35/2.8). The Sigma 17-70 is constructed with one SLD low-dispersion glass element which is responsible for its excellent lack of Chromatic Aberation. At this price I never expected that kind of quality. Highly recommended!
Click Here to see more reviews about: Sigma 17-70mm f/2.8-4.5 DC IF Macro Lens for Canon Digital SLR Cameras
Designed for Canon digital SLR cameras, the Sigma 17-70mm f/2.8-4.5 macro lens performs superbly even in relatively low light conditions, such as indoors or at dusk. The lens incorporates an inner focusing system that provides a fast autofocus speed while also preventing the front of the lens from rotating. This makes it particularly suitable for use with circular polarizing filters and petal-shaped lens hoods. The lens is also equipped with a zoom lock switch that eliminates "zoom creep" during transportation. And thanks to the special low dispersion (SLD) element and two aspherical elements, the lens corrects for all types of aberrations and produces a high level of optical performance throughout the entire zoom range. Other features include a minimum focusing distance of 7.9 inches, a maximum magnification ratio of 1:2.3, and a multilayer lens coating that reduces flare and ghosting. All Sigma lenses carry a one-year warranty.
Specifications
Focal length: 17-70mm
Maximum aperture: f/2.8-4.5
Lens construction: 15 elements in 12 groups
Angle of view: 72.4 to 20.2 degrees (Sigma SD format)
Number of diaphragm blades: 7
Minimum aperture: f/22
Minimum focusing distance: 7.9 inches
Maximum magnification: 1:2.3
Filter size: 72mm
Corresponding AF mounts: Canon
Dimensions: 3.1 inches in diameter and 3.2 inches long
Weight: 16.0 ounces
Warranty: 1 year
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