Sigma Wide Angle 24mm f/1.8 EX Aspherical DG DF Macro Autofocus Lens for Canon EOS

This 24mm lens has a fast f/1.8 maximum aperture with macro focusing capability (minimum focusing distance is 7.1" for a reproduction ratio of 1:2.7). The9-bladed aperture diaphragmobtains beautiful, circular out of focus characteristics. It incorporates afloating focus systemand usestwo aspherical elementsfor minimized distortion, spherical aberration and astigmatism. The lens front does not rotate during focusing, thus allowing the use of a "perfect hood" and the easy polarizing filters. Optical construction was created to minimize light falloff (darkening of the image corners) at maximum aperture-a big benefit particularly for digital cameras. Materials used in this lens arelead and arsenic freeecological glass