Sony SAL-14TC 1.4x Teleconverter Lens for Sony Alpha Digital SLR Camera 1.4x teleconverter lens for Sony Alpha lenses Designed to support Sony G-Series 70-200mm f2.8 G telephoto zoom and 300mm f2.8 G telephoto lenses, plus the Sony 135mm f2.8 STF lens Extends the telephoto range of your primary lens. Allows you to carry less equipment on location. 35 mm equivalent focal length (APS-C) and Angle of View (APS-C) are with interchangeable lens digital camera incorporating APS-C type image sensors. Superb optical performance for excellent results