Sigma TC-2011 2x Teleconverter for L-Mount LensesThe Sigma TC 2011 Teleconverter is designed exclusively for use with Sigma mirrorless lenses. Mounted between a lens and a camera body, the teleconverter magnifies the focal length by 2x. The superior optical performance of the Sigma Contemporary, Art and Sports lines of lenses is the result of efforts to pursue the highest levels of image quality. Dust and Splash Proof Construction The Sigma TC 2011 Teleconverter upholds the image quality of the