To meet user demands for a fast EF-S zoom lens, Canon has specially designed a new lens with a large aperture of f/2.8 for select Canon Digital SLR cameras.* The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject. The lens construction includes UD and aspherical elements, which deliver impressive image quality throughout the entire zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light. With a Ring-type USM, inner focusing and new AF algorithms, this lens achieves autofocus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the focus is possible even in AF mode.
Designed specifically for digital photography, the lens has specially shaped lens elements and Super Spectra coatings to suppress ghosting and flare, which can be caused by reflections off digital camera sensors. A fast, constant maximum aperture of f/2.8 is ideal for low light shooting, utilizing fast shutter speeds and for shallow depth of field control. Optical image stabilization enables up to 3 shutter speed stops of blur compensation to create clearer images when shooting handheld and in low light situations. Ring-type Ultrasonic Autofocus Motor (USM) provides quiet, fast, precise auto focusing and predictive tracking.
Features included three aspherical lens elements (two types) as well as a UD glass element for reduced aberrations and high image quality at all focal lengths. Optimized lens coating minimizes flare and ghosting prone to occur with digital cameras. Internal focusing and new AF algorithms improve AF speed and with full-time manual focus override allows precise manual focus even in AF mode. Uses optics designed to take full advantage of the small image circle and short back focus in EF-S lenses. Circular aperture diaphragm produces brilliant out-of-focus characteristics
