Lens construction is 14 elements in 11 groups.
Focal length is 14mm, maximum aperture is 1:2.8 and has gel filter holder at rear of lens.
Closest focusing distance is 7.9 inches.
Diagonal angle of view is 114 (on full-frame cameras).
Dust and moisture proof built in lens hood.
Compatible with all EOS Digital SLR cameras.
Redesigned optics including 2 high-precision Aspherical elements and 2 new UD-glass elements.