Canon EF 14mm f/2.8L USM Ultra Wide Angle AutoFocus Lens  

This ultra-wide-angle lens has the shortest focal length in the L-series. Element 2 is an aspherical lens to correct distortion. Other aberrations such as astigmatism are also corrected, resulting in ideal image quality. The lens has a fixed, petal-type hood and a gelatin filter holder at the rear.
Specifications
Construction 10 groups /14 elements
Angle of view 114°
F stop range 2.8-22
Closest Focusing Distance 0.25m / 0.8 ft.
Maximum Magnification 1:10
Filter Size Rear Gel Holder
Dimensions (Length x Diameter) 3.0" x 3.5" / 77.0 x 89.0mm
Weight 1.2 lbs./ 560g