The Sigma 2.0X Teleconverter EX APO DG
Sigma helps you extend your range with the 2.0X Teleconverter EX APO DG. It offers superior image quality in a convenient and compact package while doubling your reach with your telephoto lenses making it ideal for distant birds, field sports, and other long-reach shoots.
This dedicated APO teleconverter is simply mounted between the lens and the camera body to increase focal length by the power of 2.0X without any variation in minimum focusing distance. It also offers new multi layer coating to reduce flare and ghosting.