Specifications:

Brand Canon
Focal Length 24mm
Aperture Maximum: f/2.8
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 84°
Minimum Focus Distance 7.87″ (20 cm)
Magnification 0.23x
Optical Design 11 Elements in 9 Groups
Diaphragm Blades 7, Rounded
Image Stabilization Yes
Autofocus Yes
Filter Thread Front: 58 mm
Dimensions (DxL) Approx. 2.69 x 2.19″ (68.4 x 55.7 mm)
Weight 9.88 oz (280 g)
Package Weight 350 gms
Box Dimensions (LxWxH) 5.0 x 4.9 x 4.8″

Features:

Wide-angle 24mm f/2.8 lens is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides a 38.4mm equivalent focal length.

Bright f/2.8 maximum aperture benefits working in low-light conditions and also affords control over depth of field for working with selective focus techniques.

One aspherical element helps to suppress spherical aberrations and distortion for a high degree of 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 a rear focusing system, is employed to deliver fast and precise autofocus performance as well as full-time manual focus override.

Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.