Sigma 150mm f/2.8 AF APO EX DG OS HSM Macro Lens for Nikon Digital SLRs Macro Lens With 1:1 Magnification Focuses to 15" Optical Image Stabilization Hyper-Sonic Motor for Fast, Quiet AF 3 SLD Elements Correct Aberrations Splash-Proof Construction Protects Lens For Nikon SLR Cameras