Sigma 24-70mm F2.8 EX DG Macro (Nikon) To achieve an F2.8 aperture at all focal lengths, it employs three aspherical Lens to provide optimum aberration compensation.
Two Special Low Dispersion (SLD) glass elements are provided for color aberration compensation, to assure high image quality. Optimized for digital SLR cameras
It incorporates "Super Multi Layer Coating" to reduce the influence of harmful light caused by reflections from the digital image sensor. Excellent correction of aberrations
Two SLD elements, one Glass Mold Aspherical plus two Hybrid Aspherical lenses provide excellent correction
of various aberrations and a high level of optical performance. Minimum focusing distance of 40cm (15.7 inches)
The lens has a minimum focusing distance of 40cm (15.7 inches) at all focal lengths and is capable of macro
photography with a maximum magnification ratio of 1:3.8. DF (Dual Focus) System
This lens incorporates a Dual Focus (DF) system that is designed to make the lens easy to hold during auto
focusing, and yet provides a large focus ring for easy manual focusing. Petal Type Hood
Since the front of the lens does not rotate, a Petal-type hood and circular polarizing filters can be easily used. Lens Construction - 13 Elements in 14 Groups
Angle of View - 84.1 -34.3 degrees
Number of Diaphragm Blades - 9 Blades
Minimum Aperture - F32
Minimum Focusing Distance - 40cm / 15.7 in.
Maximum Magnification - 1:3.8
Filter Size - 82mm
Dimensions - Diameter 88.7mm X Length 115.5mm
Weight - 715g / 25.2oz. 
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