Canon EF 28mm f/1.8 USM AutoFocus Wide Angle Lens      

With the large maximum aperture, excellent background blur is possible even with a fast shutter speed. The aspherical lens element makes the lens compact and corrects spherical aberrations. The image is sharp even at the edges. Lead-free glass is used.
Specifications
Construction 9 groups /10 elements
Angle of view 75°
F stop range 2.8-22
Closest Focusing Distance 0.25m / 0.8 ft.
Maximum Magnification 1:5.5
Filter Size 58mm
Dimensions (Length x Diameter) 2.9" x 2.2" / 73.6 x 55.6mm
Weight 10.9 oz. / 310g