Bundle Items Included: Sigma TC-1401 1.4x Teleconverter for Canon EF, Front Cap, Rear Cap, Soft Carrying Case, Microfiber Cloth, Lens Cleaning Kit, and 12' Flexible Tabletop Tripod. Canon EF Teleconverter. Communication between Lens & Camera. 1.4x Magnification Factor AF Operates at up to f/8. Compatible Lenses: 60-600mm f/4.5-6.3 DG OS HSM Sports 70-200mm f/2.8 DG OS HSM Sports 100-400mm f/5-6.3 DG OS HSM Contemporary 120-300mm f/2.8 DG OS HSM Sports 150-600mm f/5-6.3 DG OS HSM Sports 150-600mm f/5-6.3 DG OS HSM Contemporary 500mm f/4 DG OS HSM Sports 70mm f/2.8 DG Macro Art