The Sigma 1.4x TC-1401 teleconverter is designed exclusively for Sigma's Global Vision lenses, including the Art, Sports, and Contemporary ranges. When placed between a telephoto lens and a camera, it increases the focal length magnification by 1.4x. It features Special Low Dispersion glass elements for aberration correction and a dust-proof and splash-proof construction for enhanced durability. The TC-2001 ensures full communication between the lens and camera, supporting autofocus at F8. The Sigma TC-1401 is compatible with the Sigma 120-300mm f2.8 DG OS HSM Sport, 150-600mm f5-6.3 DG OS HSM Sport, and 150-600mm f5-6.3 DG OS HSM Contemporary lenses. It offers the best glass quality and is built to withstand dust and splashes, ensuring reliable performance in various conditions.