Professional quality tele converter to extend the range of your lens using this compact tele converter lens you can extend the photographic range of your primary sony a mount 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 f28 g telephoto zoom and 300mm f28 g telephoto lenses as well as the unique sony 135mm f28 stf smooth transition focus lens