The Kenko Teleplus MC4 AF 2.0 DGX  teleconverter doubles the magnification of the original focal length of a lens, for example converting a 50mm lens to a 100mm lens, which allows for quick and easy telephoto capability with existing lenses.The MC4 AF 2.0X DGX converter features Kenko’s Gate Array IC (Integrated Circuitry) technology, which maintains signal integrity between the camera body and lens. The 4-element design is manufactured with multi-coated Hoya optical glass to maintain quality. Full AF operation is possible with lenses equipped with open apertures of f/2.8 or brighter, though some lenses may require manual focusing when smaller apertures are used. All exif data  information will reflect the equivalent aperture, focal length and setting of the lens and teleconverter combination.The Teleplus MC4 AF 2.0 DGX  teleconverter is compatible with the following Sony lenses:35mm  f/1.4 G50mm  f/1.475-300mm  f/4.5-5.6 (Manual Focus Only)500mm  f/8 Reflex  (Manual Focus Only)SAM 28-75mm  f/2.8 (Manual Focus Only)SSM 70-200mm  f/2.8 GSSM 70-400mm  f/4-5.6 G (Manual Focus Only)* Not compatible with the 135mm f/2.8 STF or the Sony NEX adapter