SIGMA LENS 24-70mm f2.8 EX Aspherical DG DF SLR Camera Lens Accepts 62mm 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 for a high level of optic integrity The lens materials used in this new lens are lead and arsenic free ecological glass