Sigma 24-70mm f/2.8 DG OS HSM Art lens for Nikon F-mount now in stock (+ reviews & comparisons) - Nikon Rumors
Which SIGMA lenses fit my mirrorless cameras and DSLRs? - Sigma
Amazon.com : Sigma 150-600mm 5-6.3 Contemporary DG OS HSM Lens for Nikon DSLR Cameras + Sigma USB Dock with Altura Photo Complete Accessory and Travel Bundle : Electronics