The two new SIGMA tele-converters TC-1411 and TC-2011 have been developed exclusively for use on our lenses for mirrorless cameras. The SIGMA Tele-Converter TC-1411 maintains the image quality of the lens to a high degree and at the same time extends the focal length. Mounted between the lens and the camera body, the TC-1411 increases the focal length of the camera by 1.4 times. The teleconverter is designed to be dust- and splash-proof, comparable to the lenses of the Sports line, and thus, in conjunction with dust- and splash-proof camera housings and lenses, allows use under harsh conditions. The SIGMA 100-400mm F5-6.3 DG DN OS | In combination with the SIGMA Tele converter TC-1411, Contemporary becomes a 140-560mm f7-9 AF ultra-telephoto lens.