The Canon EF 14mm ƒ/2.8 II USM updates its predecessor of the same name, adding a 'II' designation to reflect the overhaul of the lens. Specifically, Canon indicates that the optical layout of the lenses has been completely redesigned. Where the original EF 14mm had one aspherical element, version two now contains two aspherical elements and two ultra-low dispersion glass elements. The new lens also adds an aperture blade, going from 5 to 6.
The 14mm f/2.8 features an integrated lens hood without a filter ring; filters may be added to a rear element gelatin filter holder. As an EF lens, the image circle is full-frame 35mm. Read the whole review here & you can buy the lens here