Canon EF-S 17-85mm f4-5.6 IS USM Lens 67mm secure switching between auto and

secure switching between auto and manual focus to accommodate personal shooting techniques

retaining subject-working distance through the focus range

The design is refined

It has four UD-glass elements to correct chromatic aberrations

Canon EF-S 17-85mm f4-5.6 IS USM Lens 67mm secure switching between auto andEquivalent to a 28 135mm lens, the Canon EF S 17 85mm f4 5. 6 IS USM Lens brings true wide angle to tele coverage to EOS 60D, EOS 7D and Digital Rebel cameras. It has Canon's Image Stabilization system, allowing safe hand holding at speeds up to three stops slower than otherwise possible. And of course, it's optically optimized for digital SLRs. A ring type USM means both fast and silent AF, as well as full time manual focus when in the AF mode. EF S