Overview

The Sigma 2x EX DG Tele Converter is a 2x teleconverter designed for Sigma lenses, offering compatibility issues with Nikon lenses due to communication and autofocus problems. Optically, it turns a 120-300mm f/2.8 into a 240-600mm f/5.6, providing extended reach at a lower cost than comparable Nikon/Canon setups. Build quality is typical for Sigma EX DG series, but autofocus may be lost on non-Sigma lenses. It suits Sigma lens owners seeking affordable reach, but not for cross-brand use.