The EF-S series of objectives to Canon lenses are unique to Canon digital SLR cameras, as applicable, for example, the EOS 20D and Rebel models. Why? The main feature of the project is the APS-C size image sensor with the circle image. How? The goal is reached appropriate to reduce the distance between the rear of the lens and the focal plane, ie the size of the reduced image circle.

The result: Canon EF-S objectives are more efficientin terms of: cost and weight of wide angle lenses, while an excellent image quality, resolution and contrast at all focal lengths.

As a member of the family EF-S lenses, the F4 17-85 IS USM is a high performance wide angle to telephoto. The list of features include: image stabilization for hand situations and optical digital SLR camera for the optimized design for a ring USM autofocus quickly and quietly. The full manual focus in AF modeis also useful.

The EF-S 17-85mm f/4-5.6 IS USM offers a 5x zoom ratio and an angle of view equivalent to a lens 27-136mm on a 35mm camera. Even this goal is a glass-molded aspherical lens with aspherical surfaces on both sides. The result, exceptional image quality across the entire zoom range. The focusing distance is a distance of 12 cm impressive at all focal lengths. Finally, the EF-S 17-85mm IS is compared with the EF 28-135mm IS lens,5% smaller and 12% lighter and takes filters of 67 mm.

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