Professional-quality tele-converters to extend the range of your lenses Using this compact tele-converter lens, you can extend the photographic range of your primary lens by 2x - allowing you to cover more distance and capture more subjects without the burden of extra equipment. Designed to support Sony G-Series 70-200mm f/2.8 G Telephoto Zoom and Sony G-Series 300mm f/2.8 G Telephoto lenses as well as the unique Sony 135mm f/2.8 STF (Smooth Transition Focus) lens.