Sigma 24-70mm f/2.8 EX DG Macro Aspherical Large Aperture Standard Zoom Lens for Nikon SLR Cameras Accepts 82mm size filters Variable zoom offers excellent image definition and increases your creative possibilities, when compared to a standard 50mm 'normal' lens The use of two (2) SLD (The Special Low Dispersion) glass elements results in excellent correction of chromatic aberration The lens materials used in this new lens are lead and arsenic free ecological glass