Equipped with 1 SLD (Special Low Dispersion) glass element for maximum image quality, the new Sigma Global Vision teleconverters utilize a splash and dust proof construction for long lasting durability. Created exclusively for the Global Vision lenses, these teleconverters ensure the utmost in compatibility, even for large diameter lenses. With effective AF at F8 and 1.4x the reach, get the most out of your Sigma lens.

Teleconverter TC-1401 is only compatible with the Global Vision lenses listed above. 
*1 It becomes compatible with the new tele converters once the lens firmware is updated to Ver. 1.01 or later.
*2 It becomes compatible with the new tele converters once the lens firmware is updated to Ver. 1.02 or later.
*3 It becomes compatible with the new tele converters once the lens firmware is updated to Ver. 1.03 or later.
*4 When SIGMA TELE CONVERTER TC-1401 is attached to cameras that are compatible with AF at F8, it is possible to shoot with AF. In cases where contrast or brightness level of the shooting object is low, it may not focus properly.

Please be advised that the updated version of lens firmware will make it compatible with the new tele converters, however it will also make it incompatible with conventional APO TELE CONVERTER 1.4x EX DG and APO TELE CONVERTER 2x EX DG.