Specifications:

Brand: Canon
Focal Length 24 – 70mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 84° – 34°
Minimum Focus Distance 7.87″ (20 cm)
Magnification 0.7x
Maximum Reproduction Ratio 1:1.4
Optical Design 15 Elements in 12 Groups
Diaphragm Blades 9, Rounded
Image Stabilization Yes
Autofocus Yes
Filter Thread Front: 77 mm
Dimensions (DxL) Approx. 3.28 x 3.66″ (83.4 x 93 mm)
Weight 1.32 lb (600 g)
Package Weight 1 kg
Box Dimensions (LxWxH) 8.0 x 5.25 x 5.25″
Package Type Bulk Packaging (White Box)

Features:

Standard zoom is designed for full-frame Canon EF-mount DSLRs, however, can also be used with APS-C models where it provides a 38.4-112mm equivalent focal length range.
Constant f/4 maximum aperture maintains consistent illumination throughout the zoom range.

Two ultra-low dispersion glass elements noticeably reduce color fringing and chromatic aberrations for high clarity and color fidelity.
Two aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering.

Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.
An Optical Image Stabilizer helps to minimize the appearance of camera shake by up to four shutter speed stops to better enable working in low-light conditions and with slower shutter speeds.

A ring-type Ultrasonic Motor (USM), along with an internal focusing design, optimized focusing algorithms, and a high-speed CPU, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override.

Minimum focusing distance of 1.2′ is available throughout the zoom range and a dedicated macro position can be used to achieve a maximum magnification of 0.7x in conjunction with a minimum focusing distance of 7.9″.
Rounded nine-blade diaphragm contributes to a pleasing out-of-focus quality that benefits the use of shallow depth of field and selective focus techniques.

Protective fluorine coating has been applied to the front and rear elements to resist fingerprints and smudges and to make cleaning these elements significantly easier.