EF-S Lenses By reducing the distance from the rear of the lens to the focal plane and reducing the size of the image circle to match the size of the APS-C imaging sensor used in digital SLRs such as the EOS 20D camera and Digital Rebel camera,Canon's EF-S lenses reduce the size, weight and cost of wide-angle lenses for these cameras while at the same time producing high image quality with superb resolution and contrast at all focal lengths. EF-S 10-22 3.5/4.5 USM This exciting new zoom lens provides ultra wide-angle coverage to the EOS 20D camera and Digital Rebel camera shooter. Equivalent toa 16-35mm zoom for a 35mm film camera, it offers excellent performance and optics designed from the ground-up for digital SLR use. Excluding fisheye lenses, the EF-S 10-22mm f/3.5-4.5 USM lens has the shortest minimum focal length ever offered for interchangeablelens digital SLRs with APS-C image sensors. Photographers will achieve consistently excellent image quality throughout the zoom range of this lens because of its 3 Aspherical elements and 1 Super-UD element in a 13-element optical formula. A ring-type ultrasonic focusing motor (USM) provides fast and silent AF along with full-time manual focus. Minimum focusing distance is 9.5 inches for breathtaking close-ups. The EF-S 10-22mm f/3.5-4.5 USM lens is relatively light and compact at 3.5 inches in length and a weight of 13.6 oz. The new lens accepts 77mm filters and can be fitted with an optional bayonet-mount lens hood.

• Excellent optical quality and true wide-angle coverage with select digital SLRs
• Electronic diaphragm, manually-set apertures stay constant from f/4.5 thru f/22
• Circular aperture design, natural highlights, even stopped down two stops
• Superior AF performance and speed, with full-time manual focus by simply turning ring
• Close-focusing to 9.5 inches, fill the frame with subjects as small as 3.6 x 5.4 inches
• Relatively compact size and light weight for an ultra-wide zoom lens
• Inner focusing system (no front element rotation); length doesn't change if zoomed
• EF-S lens mount, for APS sensor size Canon Cameras only (not full frame)

Specifications
Filter Size:	77mm
Weight:	13.6 oz. / 385g
F stop range:	3.5/4.5 to f/22
Dimensions (Length x Diameter):	3.5" x 3.3" / 89.8mm x 83.5mm
Construction:	13 elements in 10 groups
Closest Focusing Distance:	0.24m / 0.79 ft.
Angle of view:	Diagonal Angle of View: 107� 30' - 63� 30' Focus Adjustment: Inner focusing system, with focusing cam