Others / canon-ef / APO Tele Converter
The SIGMA APO Tele Converter 1.4x EX DG is a teleconverter that mounts between compatible SIGMA lenses and a camera to increase the focal length by 1.4x.
This particular unit is designed for the Canon EF mount and features an EX-series exterior with a DG-compatible optical design.
Compatible lenses and whether AF and exposure coupling are supported depend on the lens and camera combination.