Tamron 50-400mm f/4.5-6.3 Di III VC VXD - Sony

8x ultra-telephoto zoom lens Outstanding image quality throughout the entire 50-400mm zoom range Optical construction：24 elements in 18 groups, including 2 XLD (eXtra Low Dispersion), 3 LD (Low Dispersion) and 2 Aspherical lens elements - effectively controls aberrations including axial chromatic aberrations High-speed, high-precision AF means you’ll never miss another photo opportunity TAMRON's proprietary VC takes the shakes out of handheld shooting 1:2 magnification ratio at the 50mm end enables "half-macro photography" “Focus Limiter” function that limits the AF focus search range has been added to the TAMRON Lens Utility BBAR-G23 Coating Moisture-Resistant Construction Fluorine Coating Zoom Lock switch