Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras

Designed to meet consumer demands for a fast EF-S zoom lens, the EF-S 17-55mm offers image quality on par with Canon's highly regarded L-series lenses. The lens features a large circular aperture that produces a shallow depth of field, creating background blur that draws special attention to the photographic subject. The lens construction, meanwhile, includes UD and aspherical elements that deliver impressive image quality throughout the entire zoom range. And thanks to the Image Stabilizer lens groups--which shift to compensate for camera shake--the image appears crisp and clear on the image plane, eve in dim light. Finally, the lens offers a ring-type ultra-sonic monitor (USM), inner focusing, and new AF algorithms to help achieve autofocus quickly and quietly, along with full-time mechanical manual focusing that makes it possible to manually adjust the focus even in AF mode.

Technical Details :
* 17-55mm wide-angle zoom lens with f/2.8 maximum aperture for Canon DSLR cameras.
* AD and aspherical elements deliver impressive image quality through entire zoom range.
* Image Stabilizer lens groups shift to compensate for image shake even in dim lighting.
* Large circular aperture produces shallow depth of field; ring-type ultra-sonic monitor (USM).
* Measures 3.3 inches in diameter and 4.4 inches long; weighs 22.8 ounces; 1-year warranty.



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.

FEATURES :
* Focal length: 17-55mm
* Maximum aperture: f/2.8
* Lens construction: 19 elements in 12 groups
* Diagonal angle of view: 78 degrees (at 30 feet) to 27 degrees (at 50 feet)
* Focus adjustment: AF with full-time manual
* Closest focusing distance: 1.15 feet
* Zoom system: 5-group helical zoom (front group moves 27mm)
* Filter size: 77mm
* Dimensions: 3.3 inches in diameter, 4.4 inches long
* Weight: 22.8 ounces

CUSTOMER FEEDBACK :
This lens focuses fast and sure--even in low light, no hunting around to lock onto a subject. Pictures taken with the camera hand-held at 1/10 to 1/15 sec shutter speeds inside with no flash were tack-sharp (Thanks to the IS). With F2.8 and IS, this lens opens up a whole new world of natural low-light photography. Not only are more inside shots possible, you also have the versatility to create gorgeous bokeh. You create these bokeh effects generally zoomed to 55mm (where the kit lens' max aperture is F5.6). Since the EF-S 17-55mm f/2.8 has a constant F2.8 max aperature, you don't have to worry about the depth of field increasing as you zoom. It is so confidence-inspiring to walk around and set your aperture where you want it to give you the depth of field you want, and not really worry about the shutter speed being too slow.