28mm 1.8 EX DG Macro Lens for Nikon AF - New Addition!

"The Sigma 28mm f1.8 EX DG Aspherical Macro is one of several lenses in Sigma's exclusive EX-Series of lenses. This lens has a fast F1.8 maximum aperture, with macro-focusing capability. The Sigma 28mm f1.8 EX DG Aspherical Macro features minimum focusing, down to 7.9inches / 20cm. and a reproduction ratio of 1:2.9. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images. It incorporates the floating focus system and the use of two aspherical lens elements to minimize distortion, spherical aberration and astigmatism. The lens incorporates minimum vignetting optical construction in order to obtain adequate peripheral brightness with open aperture. Internal focus system of the lens eliminates front lens rotation, thus allowing the use of a Perfect Hood and easy use of polarizing filters. The lens also incorporates a dual-focus mechanism. It is easy to hold the lens, since focusing ring does not rotate during auto-focus, and yet provides adequate torque of the focusing ring during manual focusing of the lens. The lens materials used in this new lens are lead and arsenic free ecological glass."