Extend the range of your primary lens with the sal 20tc get more coverage distance and capture more subjects without the burden of extra equipmentusing 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 f28 g telephoto zoom and sony g series 300mm f28 g telephoto lenses as well as the unique sony 13