Spanning a wide-angle to telephoto range, the EF-S 17-85mm f/4-5.6 IS USM from Canon is a 27.2-136mm-equivalent zoom designed for EF-S-mount DSLRs. This reach is complemented by an optical design featuring one dual-sided aspherical element, which helps to minimize distortion and spherical aberrations in order to realize greater sharpness and clarity. A Super Spectra coating has also been applied that reduces flare and ghosting for improved contrast and color accuracy. The lens also features an Optical Image Stabilizer, which minimizes the appearance of camera shake by three stops to better enable shooting handheld in difficult lighting conditions. Additionally, a ring-type Ultrasonic Motor is featured, too, which affords quick, quiet autofocus performance along with full-time manual focus override.
Canon EF-S 17-85mm f/4-5.6 IS USM Lens
KSh25,000
..Pros and cons: Good wide angle and telephoto coverage ⋅ Very capable Image Stabilization ⋅
The Canon Zoom Lens EF-S17-85mm f/4-5.6 IS USM is the ideal standard zoom lens companion for Canon’s EOS 20D digital SLR camera, offering a 5x zoom ratio that enables broad shooting range from wide angle to telephoto.
While offering a wide focal range equivalent to 27-136 mm in the 35 mm format, the lens’s optical design capitalizes on the merits of the reduced image circle to realize a compact, lightweight body that is 4.8 mm shorter and 65 g lighter that the comparable EF-series lens.
Moreover, the effective positioning of a double-sided glass-molded aspherical lens element ensures exceptional image quality throughout the zoom range.
The lens incorporates Canon’s high-performance Image Stabilizer (IS), which compensates for approximately three shutter speeds to allow the handheld capture of shots that would otherwise be blurred by camera shake. Other performance-enhancing features include a fulltime manual focus override, and a 0.35 m minimum focusing distance throughout the entire zoom range for close-up magnifications. The EF-S17-85mm f/4-5.6 IS USM zoom lens features an environmentally conscious design that anticipates the EU’s Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive, which is due to take effect from July 2006. The RoHS Directive requires the elimination* of lead, mercury, cadmium hexavalent chromium, polybrominated diphenyl ethers (PBDE) and polybrominated biphenyls (PBB).
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