The 600mm f4 vr lens from nikon incorporates two fluorite lens elements and a host of high performance technologies to deliver the worlds lightest fx compatible super telephoto lens the new optical design means the weight and size can be kept to a minimum resulting in a more manageable weight of just 3810g which is an impressive 1250g lighter than its predecessor additional enhancements include a sport vr mode improved af tracking and an updated vibration reduction vr image stabilisation