The AT-X 116 PRO DX-II 11-16mm f/2.8 Lens for Canon EF by Tokina is an ultra-wide angle autofocus zoom lens with a fast constant f/2.8 maximum aperture. The AT-X 116 PRO DX-II lens is designed for digital cameras with APS-C-size CMOS or CCD sensors. Its angle of view ranges from 104-84 and it can focus as close as 11.8". Nine diaphragm blades help to produce soft out-of-focus backgrounds while two Super-Low Dispersion glass elements and two aspheric elements help to achieve excellent contrast, sharpness and minimal chromatic aberration.