Specifications:

Brand Canon
Focal Length 16 – 35mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 108° 10′ – 63°
Minimum Focus Distance 11.02″ (28 cm)
Magnification 0.23x
Maximum Reproduction Ratio 1:4.35
Optical Design 16 Elements in 12 Groups
Diaphragm Blades 9, Rounded
Image Stabilization Yes
Autofocus Yes
Filter Thread Front: 77 mm
Dimensions (DxL) Approx. 3.25 x 4.44″ (82.6 x 112.8 mm)
Weight 1.35 lb (615 g)
Package Weight 1 kg
Box Dimensions (LxWxH) 9.0 x 5.4 x 5.354″

Features:

Wide-angle zoom lens with a focal length range of 16-35mm

Aperture of f/4

Ultrasonic Motor (USM) for fast and quiet autofocus

Image Stabilizer (IS) for reducing camera shake

16 lens elements in 11 groups, including 3 aspherical elements and 2 UD elements

Minimum focusing distance of 0.92 feet (0.28 meters)

Circular 9-blade aperture for smooth bokeh

Fluorine coatings on the front and rear lens elements to repel dust and water

Compatible with Canon EF and EF-S mount cameras