Sigma 1.4X TC-1401

(From company literature) Equipped with 1 SLD (Special Low Dispersion) glass element for maximum image quality, the new Sigma Global Vision TC-1401 teleconverter utilizes a splash and dust proof construction for long lasting durability. Created exclusively for the Global Vision lenses, this teleconverter ensures 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.

The TC-1401 will be sold for the street price of US$349.