Canon EF 14mm f2.8L II USM Professional Ultra-Wide L-series Lens with high precision aspherical lens elements and UD elements to attain the best image quality in this lens class.

Ultra-Wide Professional L-series Lens
Ultra-Wide 114º angle of view (across the diagonal extent)
Superior optical performance achieved by new lens construction:
Two Glass Mould aspherical elements which correct distortion and improve optical quality
Two UD elements suppress chromatic aberrations
Flare and ghosting suppressed with optimised lens coating
Dust and Water Resistance improves with increased seals on the lens mount, switch panel and focusing ring
Circular Aperture improves the appearance of background blur
New Lens Cap design to ensure cap stays on lens securely