This lens is an EF 14mm 2.8 L USM.See full specification
Lens construction: 14 elements in 10 groups
Diagonal angle of view: 114°
Focus adjustment: Rear focusing system with USM
Closest focusing distance: 0.25m / 0.8ft
Filter size: Rear drop-in gelatin filter holder
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.