The 70 300mm f45 56 g ssm mark ii lens comes with an improved autofocus af tracking algorithm and sonys responsive super sonic wave motor ssm focus drive to deliver high speed performance which sony claim is 4x faster than the previous model the lens versatile zoom range and 12m close focusing distance makes it an excellent choice for a variety of subjects from sports travel and wildlife to portraits and more reliable operation in a variety of conditions is ensured by its rugged co